20.0 mL water sample was titrated with 0.0100 M EDTA solution that required 14.50 mL for CaCO3 hardness. The total hardness of the water sample in terms of CaCO3 (MW = 100.1 g/mole) in parts per million is _________? Note: Express final answer using least number of significant figures.
Q: 2 CuF + HS 2 HF For the following reaction: What is the mass in grams of copper (1) sulfide that is…
A:
Q: binding Compounds hat fanetion mixed imibitors " with Subsrate to the enzyme ) bind to the enzyme…
A: Enzyme Inhibitors are the molecules that interferes the catalysis as well as halting the enzyme…
Q: 5. Consider the reaction FeO(s) + CO(g) = Fe(s) + CO:(g) for which Kp is found to have the following…
A: Given that, an equilibrium reaction is FeO(s) + CO(g) ⇔ Fe(s) + CO2(g). The equilibrium constant…
Q: Draw the correct structure of the indicated product for each reaction. H,O+ → product 2 Br KCN…
A: The first step is the substitution reaction of benzyl bromide with KCN resulting in substitution of…
Q: Determine maximum number of electrons in p atomic orbitals. Group of answer choices A.) 10…
A:
Q: Epinephrine contains the __ group that is absent in norepinephrine. The donor of this group is…
A: Structure of epinephrine and norepinephrine
Q: Calculate AE and determine whether the process is endothermic or exothermic tor the following cases:…
A:
Q: 2. Draw the Lewis dot structure for each of the following molecules or ions. Determine the number of…
A: Lewis structure is the representation of bonding electrons and non bonding electrons. Bonding…
Q: 3. Which statement is an accurate description of electron affinity? electron affinity is always a…
A:
Q: grams of B2O3 could be formed?
A:
Q: Are CO2, CO, HCl environemetal pollutant? If they are, why?
A: Carbon monoxide is one of the most pollutant gas which harms our environment so badly and it is…
Q: a. Consider the following chemical equation: HNO3 + pFeCl2 + qHCl → rFeCl3 + NO + 2H2O Which of the…
A: a) Balanced the reaction ---> HNO3 + pFeCl2 + qHCl ----> rFeCl3 + NO + 2H2O
Q: Select the major product(s) of the following reaction. pyridine HO + CI
A:
Q: 9. Which of the following elements has the largest first ionization energy? A) Bе B) Mg С) Са D) Sr…
A: In this question, all the element present in 2nd group of the periodic table and when we move down…
Q: Part A Complete the following reaction by filling in the necessary reagents. HyC- N.
A:
Q: 4. C3H5NO a peaks S total peaks 1 1:3 200 180 160 140 120 100 80 60 40 12 11 10 6. 8. 3 2. ppm…
A: M. F C8H5NO
Q: À sample of solid NH 4NO 3 was placed in an evacuated container and then heated so that it…
A: Given-> At equilibrium the total pressure of container= 2.34atm T = 500°C
Q: For biological and medical applications, we often need to consider proton transfer equilibria at…
A:
Q: To make 525mL of the 0.15M NaOH solution, how much water do you need to add to the 31.5mL of the…
A:
Q: Consider the decomposition of liquid benzene, C6H6 (), to gaseous acetylene, C2H2 (g) C6 H6 (1) →…
A:
Q: t Was the IIItial tenperature in C? tem has initial volume and temperature of 8160mL and 467.0K. !f…
A: Given-> V1 = 8160 ml T1 = 467.0 K T2 = -151°C = -151 + 273 = 122K
Q: Select the major product of the following reaction. + 10% NaOH 50 °C ОН HO, ph ph ph ph II III IV O…
A:
Q: Name the main product of the following chemical reaction. ОН + LIOH O methyl benzoate lithium…
A:
Q: 2.2 5. (a) State the technique used to separate Crude Oil into its various fractions (b) Explain how…
A: It is asked in the question how to separate different fractions of crude oil from the crude oil.
Q: A balloon contains 0.128 mol of gas and has a volume of 2.76 L. If an additional 0.073 mol of gas is…
A:
Q: a. In which of the following reactions does the oxidation number of carbon show the greatest…
A: Given, A. CH4(g) + 2O2(g) → CO2(g) + 2H2O(l)B. C(s) + O2(g) → CO2(g)C. 2CO(g) + O2(g) → 2CO2(g)D.…
Q: Sodium lauryl sulfate has the same use in embalming fluids as: 1. sodium phosphate 2. citrates 3.…
A: Sodiun lauryl sulfate used in fluid as surfactants.
Q: At the equivalence point for the titration of HCN with KOH, the pH is expected to be A) 7 B) greater…
A: What is the pH at the equivalence point of titration of HCN with KOH?
Q: (ii) Name the following using IUPAC system of nomenclature: (a) CH, (CI) CH (NH,) CHO (b) CH, C (Br)…
A: 1. Select the principle carbon chain 2. Numbering 3. Naming (prefix + word root + suffix)
Q: A 1.48 L buffer solution consists of 0.128 M butanoic acid and 0.338 M sodium butanoate. Calculate…
A:
Q: Draw the structures of all possible organic products formed in the reaction. Do not draw counterions…
A:
Q: 6. Next determine the current pressure by going to weather.gov and typing in your zip code. The…
A:
Q: 58- How much heat is released when 40 g of steam at 250 °C that cools to water at 30 °C (Cs heat of…
A: Formula used: Heat exchange in cooling: q = mC∆T Where q = heat m = mass C = heat capacity ∆T…
Q: 1) Give the proper solution, the given, and what is asked.
A:
Q: For the reaction below (the one you will be studying during this lab), write an expression for the…
A:
Q: Show that [4+4] cycloaddition of two butadiene molecules to give cycloocta-1,5-diene is thermally…
A:
Q: Place the best reagent and conditions in the bins for each of the following reactions. One of the…
A:
Q: cyclohexylethyl ether CH;CH,Br Br CH;CH,O
A: Given, Below are two possible means of synthesizing the following compound, cyclohexyl ethyl ether.…
Q: 21. Which radical is less stable? CH CH, CH CH CH 1 3.
A: we need to determine the less stable radical
Q: Calculate the volume of 0.500 M HCOOH and 0.500 M HCOONA required to prepare 0.100 L of pH 4.50…
A:
Q: What is the name of the protein for this code: 7DFQ?
A: The correct answer is given below
Q: solution that was prepared as follows: 2.50 g of NaNO3, 2.50 g of Pb(NO3)2 and 2.50 g of Ca(NO3)2…
A: Given, Volume = 1000 mL = 1.0 L mass of NaNO3 = 2.50 g Mass of Pb(NO3)2 = 2.50 g Mass of Ca(NO3)2 =…
Q: [Review Topics] [References] Provide an IUPAC name for the compound below. wireframe O- + labels…
A:
Q: A student must make a buffer solution with a pH of 2.00. Determine which weak acid is the best…
A: A buffer works best at a pH closer to the pKa value of the acid. Closer the pKa value of the acid to…
Q: Which direction will the reaction proceed to reach equilibrium? Select an answer and submit. For…
A:
Q: H.C
A: Answer:
Q: 4.The following two molecules undergo stereospecific eliminations reactions. Draw the expected…
A: Elimination reactions are the ones in which the leaving group and proton leave the substrate making…
Q: Calculate the standard free-energy change for the reaction at 25 °C. Refer to the list of standard…
A:
Q: A) O B) S C) Se D) Te E) Po
A: On going down the group, the atomic radius increases.
Q: Calculate the pH of milk of magnesia whih has a [ OH- ] of 1.0 x 10-4 M.
A: [OH-] = 1.0 × 10-4 M pH = ?
- 20.0 mL water sample was titrated with 0.0100 M EDTA solution that required 14.50 mL for CaCO3 hardness. The total hardness of the water sample in terms of CaCO3 (MW = 100.1 g/mole) in parts per million is _________?
Note: Express final answer using least number of significant figures.
2. If 35.2 mL of EDTA solution is required to reach the endpoint with 0.3120-g of primary standard grade CaCO3 (MW = 100.1 g/mole), the normal concentration of the EDTA (MW = 292.24) solution is _________ N?
Trending now
This is a popular solution!
Step by step
Solved in 3 steps with 2 images
- Table 8.1 Hardness determination of water samples. Volume of NazHY 2 H20, mL Ca+, mg/L (mean SD) mL of Replicate Sample Initial Final Volume added 54 mL 15.1 15.1 1 54 mL 15.1 30.7 15.6 2 54 mL 30.7 45.3 14.6 3 Sample Calculations (show calculation for one replicate only) mg. (mL of titrantsample) (M of titrant)(40000) Ca2+ mL of sample mg. Ca2+ Biology Environmental Science1. Straight lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO): Estimate the lime dose (in mg 1.) required to soften the water. HCO 155mg/1 Ca 210 mg Mg-15mg/1 Alk.-260 ml Temp-10C 2. Excess lime softening A groundwater was analyzed and found to have the following composition (all concentrations are as CaCO)). Estimate the lime dose (in mg/L.) required to soften the water.. H:CO 155mg/1 Ca 180 mg/1 Mg-60mg/1 Alk. -260 mg/1 Temp-10CTable 2: Absorbance Values of Standards and Unknowns. Sample Blank Standard Solution 1 Standard Solution 2 Standard Solution 3 Standard Solution 4 Standard Solution 5 Water Sample 1 Water Sample 2 Phosphate Concentration (in ppm) Y17 0 ppm 0.02 ppm 0.04 ppm 0.08 ppm 0.16 ppm 0.32 ppm Freeman Lake 0.001 0.325 0.292 0.413 0.315 0.039 0.054 0.049 Absorbance at 2= 690 nm Calculations: 1. Construct a phosphate standard curve in Excel by plotting concentration (in ppm) on your x-axis and Absorbance (unitless) on your y-axis for your known solutions. Label the axes on the graph and provide the curve with a title. Use a linear trendline to generate a best fit line to your data. Label the graph with the equation and the R" value. Insert your labeled graph in the space below. X
- C1. A carefully weighed 280mg Calcium carbonate was used in the standardization of an EDTA solution. Initially, 25mL of the titrant was consumed but only after the addition of another 10mL of the titrant did an endpoint was visible. What is the MW of calcium carbonate? (use C1 as reference)* 102 g/mol 98 g/mL 100 g/mL 100 g/mol What is the molar concentration of the standardized EDTA solution? (use C1 as reference)* 0.08m 0.8M 0.08N 0.08M How many grams of EDTA (MW: 292 g/mole) is required to prepare 250mL of a 0.025M solution?* 0.1825 0.1852 1.825 1.1852100 mL tap water is titrated with 20 mL of 0.02 M EDTA solution to determine the hardness of the water. The second 100 mL tap water is precipitated as CaC2O4 and removed by filtration and the filtrate is titrated with 8.0 mL of the same EDTA solution. What are the concentrations (as ppm) of Ca2+ (40.078 g/mol) and Mg2+ (24.305 g/mol) ions in the water? 2) 10 g of a solution, containing one or more of NaOH, Na3PO4, Na2HPO4, NaH2PO4, H3PO4 and HCl substances, is titrated with 1.0 M NaOH using the phenolphthalein indicator and 34.5 mL NaOH is used. Another 10 g mixture was titrated to reach the bromocresol green end point and 20.50 mL NaOH is used. What is the composition of the solution? What are the percentages of the species(H:1.0078, O:15.99, Na: 22.98, P:30.974, Cl:35.453)?You took 25.00 mL of unknown water solution and titrated it with EDTA. The EDTA solution molarity was 0.01 M, and it took 16.50 mL to reach the end point. With the blank it took only 0.98 mL to reach end point. 15.52 mL of EDTA solution were used to titrate hardness that actually came from the unknown 1.552×10−4 moles of EDTA reacted with hardness-causing ions from the unknown sample 1.552×10−4 moles of hardness-causing ions were present in the unknown sample A) Assuming that the total hardness of water is due to CaCO3, how many grams CaCO3 does it correspond to? B) What is the total hardness of the unknown water in ppm CaCO3?
- Students measured the concentration of HCl in a solution by titrating with different indicators to find the end point. (Use the table to find critical F values.) Mean HCl concentration (M) (+ standard deviation) Indicator Number of measurements 1. Bromothymol blue 0.09565 + 0.00170 28 2. Methyl red 0.08681 ± 0.00098 18 3. Bromocresol green 0.08641 + 0.00106 29 Is the difference between Indicators 1 and 2 significant at the 95% confidence level? O Yes O No Fenlculated clegrees of freedom Ecalculated Is the difference between indicators 2 and 3 significant at the 95% confidence level? O Yes O No Fealculated Spooled tcalculatedA. Calculate the solubility of PbI2 (Ksp = 1.5 x 10-8) in moles per liter. Ignore any acid–base properties. B. Calculate the solubility of CdCO3 (Ksp = 5.1 x 10-12) in moles per liter. Ignore any acid–base properties. C. Calculate the solubility of Sr3(PO4)2 (Ksp = 1.5 x 10-31) in moles per liter. Ignore any acid–base properties.2. 100 mL tap water is titrated with 20 mL of 0.02 M EDTA solution to determine the hardness of the water. The second 100 mL tap water is precipitated as CaC204 and removed by filtration and the filtrate is titrated with 8.0 mL of the same EDTA solution. What are the concentrations (as ppm) of Ca²* (40.078 g/mol) and Mg* (24.305 g/mol) ions in the water?
- A 0.9092g sample of wheat flour was analyzed by Kjeldahl method. The ammonia formed was distilled into 50.00 mL of 0.05063 M HCl; a 7.46 mL back titration with 0.04917 M NaOH was required. Calculate the % protein in the flour. Input the value only. Express in 2 SF.Concentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (ml) Volume titration 2, (ml) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (mL) Standard deviation Number of moles sodium thiosulfate used, (mol) Number of moles calcium iodate in solution, (mol) Volume of calcium iodate used, (mL) Concentration of saturated calcium iodate solution (mol L-¹) Unrounded value 15.9750 0.26220 Rounded value 15.97 0.262 10.0Concentration sodium thiosulfate solution used: 0.056 mol L-1 ACCURATE TITRATION VOLUME OF SODIUM THIOSULFATE SOLUTION USED Volume titration 1, (mL) Volume titration 2, (mL) Your Group 15.80 15.75 Group 1 16.05 15.70 Group 2 16.30 16.25 ANALYSIS Average volume used, (ml) Standard deviation Number of moles sodium thiosulfate used, (mol) Number of moles calcium iodate in solution, (mol) Volume of calcium iodate used, (mL) Concentration of saturated calcium iodate solution (mol L-¹) Unrounded value 15.9750 0.26220 0.00089400 0.00036700 A Rounded value 15.97 0.262 8.94 x 10-4 10.0 Minimize