Chapter 3, Problem 3.3QAP

a) If 42.1 mL of 1.02 M sodium hydroxide, measured using a graduated cylinder, is placed in a beaker filled with 300 mL of DI water, what is the concentration of the diluted NaOH solution?b) Why does this calculation only provide an estimate of the NaOH concentration? In other words, why do we have to standardize the NaOH in this experiment to find its exact concentration?(Hint: think about the glassware used and refer back to the worksheet on glassware at the beginning of the semester.)

Most analytical machines used in science can either measure absorbance of light, like the spectrophotometers used in BioZ 151 and 152 labs, or can measure change in electrical conductance. In order to convert things like absorbance values into concentration data, a linear regression is used. In order to determine nitrite concentration in water samples, nitrite is reacted with several chemicals to produce a purple color. The absorbance of the solution is measured from known amounts of nitrite to produce a standard curve to analyze samples. Use the data in the provided table, or from the linked spreadsheet  (Links to an external site.)to make a graph and perform a linear regression using treadline.   mg/L NO3- Absorbance 0 0 0.1 0.183 0.3 0.542 0.5 0.914 0.7 1.298 1 1.61   In order for this to work, samples must be diluted prior to measurement so that the concentration falls within the range of the standard curve. If a sample underwent a 87 dilution, and produce an…

Convert the experimental glucose concentration (provided in the table below) from mM (millimolar) to g/100 mL. Write a step-by-step guide with key words for the Chem 2 students on how to do these calculations. You can use diagrams, a table or just type the steps out. Ensure the steps are clearly written and easy to follow  Drink # Glucose Concentration in mM 1 2.340 mM 2 0.288 mM 3 3.500 mM 4 0.136 mM 5 1.673 mM

Most analytical machines used in science can either measure absorbance of light, like the spectrophotometers used BioZ 151 and 152 labs, or can measure change in electrical conductance. In order to convert things like absorbance values into concentration data, a linear regression is used. In order to determine nitrite concentration in water samples, nitrite is reacted with several chemicals to produce a purple color. The absorbance of the solution is measured from known amounts of nitrite to produce a standard curve to analyze samples. Use the data in the provided table, or from the linked spreadsheet to make a graph and perform a linear regression using treadline. mg/L NO3 Absorbance 0 0.1 0.3 0.5 0.7 o 0.183 0.542 0.914 1.298) 1.61) In order for this to work, samples must be diluted prior measurement so that the concentration falls within the range of the standard curve. If a sample underwent a 30 dilution, and produce an absorbance value of 0.953, what is the resultant concentration…

You have a 0.871 M solution of magnesium chloride. You pour out 336.5 mL of this solution. How many grams magnesium chloride is in that 0.871 mL of solution? Put answer in box in regular non scientific notation with one past decimal. As always, this may seem like the wrong sig figs, but this is how the formula questions work--I must choose one amount for everybody despite the amount of sig figs Canvas ģives you. Type your answer.

An analytical chemist weighs out 0.182 g of an unknown triprotic acid into a 250 mL volumetric flask and dilutes to the mark with distilled water. She then titrates this solution with 0.0600 M NaOH solution. When the titration reaches the equivalence point, the chemist finds she has added 47.4 mL of NaOH solution. Calculate the molar mass of the unknown acid. Round your answer to 3 significant digits. 0 mol x10 X S

Express your answer as a chemical equation. Identify all of the phases in your answer.        1. Solid lead(II)(II) sulfide reacts with aqueous hydrochloric acid to form solid lead(II)(II) chloride and dihydrogen sulfide gas.        2. Gaseous carbon monoxide reacts with hydrogen gas to form gaseous methane (CH4)(CH4) and liquid water.           3. Solid iron(III)(III) oxide reacts with hydrogen gas to form solid iron and liquid water.          4. Gaseous ammonia (NH3)(NH3) reacts with gaseous oxygen to form gaseous nitrogen monoxide and gaseous water.

PART III: QUESTIONS        Question 1: a ‘law’ in science is a general statement that is the conclusion of multiple observations. Formulate a law that describes what happens when a metal chloride solution is mixed with a silver chloride solution. Question 2: Formulate a law that describes what happens when a metal chloride solution is mixed with a sodium phosphate solution.                   Question 3: If an aqueous solution of titanium chloride, which is clear and purple, is mixed with a silver nitrate solution, predict what precipitate will form. Question 4: If an aqueous solution of titanium chloride, which is clear and purple, is mixed with a sodium phosphate solution, predict what precipitate will form.

In setting up this experiment, a student noticed that a bubble of air leaked into the graduated cylinder when it was inverted in the water bath. What effect would this have on the measured volume of hydrogen gas? Would the calculated molar volume of hydrogen gas be too high or too low as a result of this error? Explain. 2. A student noticed that the magnesium ribbon appeared to be oxidized—the metal surface was black and dull rather than silver and shiny. What effect would the oxidized magnesium ribbon have on the measured volume of hydrogen gas? Would the calculated molar volume of hydrogen be too high or too low as a result of this error? Explain.c