An 8 mL volumetric pipet is used to collect a sample from a 0.2015 M solution of NaOH. a. Estimate the uncertainties in volume and concentration. b. Calculate the moles of NaOH in the sample. c. Use error propagation to find the uncertainty in moles of NaOH.
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- 1. A company illegally dumped their wastewater on a river bank. You are part of an environmental NGO that are tasked to determine what kind toxins that may have contaminated the waters. What kind of analysis would you do? a. Characterization analysis b. Qualitative analysis c. Fundamental analysis d. Quantitative analysis 2. Four groups weighed ten rock samples each, and tested the possibility of outliers using Q-test. At 95.0% confidence (a = 0.05), which of the following is considered to be an outlier? a. 0.024 b. 0.413 c. 0.453 d. 0.674 3. An unknown solution containing oxalic acid, which is a diprotic acid, is titrated against sodium hydroxide. How many mole/s of titrant is needed to react with one mole of analyte? a. ½ b. ¼ c. 2 d. 4Z Molecular P Pearson Si x I Molar mas + OWLV2 | As My Home * OWLV2 | On x Assignment/takeCovalentActivity.do?locator=Dassignment-take [Review Topics) [References) Use the References to access important values If needed for this question. a. How many grams of calcium nitrate, Ca(NO3)2, are present in 2.71 moles of this compound? grams b. How many moles of calcium nitrate are present in 3.48 grams of this compound? moles Submit Answer Retry Entire Group 9 more group attempts remaining (Previous Next 回可1. A student performed this experiment and obtained the following concentration values: 0.02813 M, 0.02802, and 0.02788 M a. what is the mean concentration? b. what is the standard deviation of these results? 3. how would the following errors affect the concentration of Cl- obtained in question 2b? give your reasoning in each case. a. the student read the molarity of AgNo3 as 0.02104M instead of 0.02014M b. the student was past the endpoint of titration when he took the final buret reading.
- Hi, Lab. A 5.00 mL sample of vinegar (dilute HC2H2O2) required 28.45 mL of 0.125 N NaOH for reaction. The density of the vinegar is 1.02 g/mL Calculate the % (w/w) of acetic acid in vinegar. Thank you,(8) Identify whether the following are examples of systematic or random error or are mistakes: a. Using an inaccurately calibrated buret. b. An uncertainty of 1 mg in the weight of your sample.∓ c. Overshooting the endpoint on your first sample, then hitting the endpoint on the remaining samples.d. Failing to let your volumetric pipet drain for a few seconds have most of the liquid has been delivered.2. You want to make 3 serial dilution, 1:100 of a 1M NaCl solution with a final dilution volume to be 1ml. a. a. How would you prepare these samples? b. What would be the total dilution factor? c. What is the final concentration of the diluted sample?
- Select the best answer. 1.) MeMgBr (excess) 2)H*, H0 3.) NaH 4.) CH3 .CI b.) d.) e) R7. Pls answer asap . Pls provide accurate answer. Help me thank uuu. Handwritten thank u.Gravimetric analysis of Fe3O4 (MW = 232 g/mole) may be undertaken with the following reactions: Fe3O4 → Fe2O3 → Fe (OH)3. Weight of sample containing 8.00% Fe3O4 that must be taken to obtain a precipitate of Fe(OH)3 (MW = 107 g/mole) that weighs 150 mg is . a. 0.108 g b. 0.325 g c. 1.355 g d. 4.065 g Amount of Fe2O3 (MW = 160 g/mole) from which 150 mg of Fe(OH)3 (MW = 107 g/mole) may be obtained is . a. 0.112 g b. 0.224 g c. 0.448 g d. none of the other choices
- only need help with "e" 1. Use the following data table and steps a-d below to calculate the concentration of the zinc carbonate. The mass of the filter paper alone (no ZnCO3) was 1.3457 g. The Zn(NO3)2 solution (10.00 mL) was mixed with 15.00 mL of the 1.00 M Na2CO3. a. Calculate the mass of zinc carbonate formed. 0.8939 b. How many moles of zinc carbonate formed? 0.00715 c. Calculate the moles of zinc in the zinc nitrate solution used. 0.00175 d. Calculate the concentration of the zinc in the zinc nitrate solution. 0.715 M e. Confirm whether sodium carbonate was in excess. Using the concentration of the sodium carbonate solution used, determine how many moles were used and confirm it was the excess reagentC. Pls answer asap . Pls provide accurate answer. Help me thank uuu. Handwritten thank u.CHSLI N' CI NH2 +. CH;CH,CH,Br + C,H5Ñ=N - H. 1. NH2 2. CH3CH2CH2B. N' CH3 1. Mg/Et20 2. CO2 3. НСі Br