Chapter 3, Problem 3.3QAP

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…

Solubility is the ability to dissolve certain substances(solutes) into a solvent. You are a student in Mrs. Bateast's Chemistry class and you were given the assignment to compare solubilities of salt in different solvents at different temperatures. You added salt at a consistent rate and amount until you reached the point of full saturation. The amount added to each solvent at saturation was recorded. The results of the experiment are shown in the tables: Table 1: 20 °C Mass of Salt at Saturation 43 g 38 g 0.01 g 3 g Solvent Water Ethanol Hexane Dichloromethane Table 2: 35 °C Mass of Salt at Saturation 52 g 45 g 0.02 g 4 g Solvent Water Ethanol Нехane Dichloromethane Using CER and your knowledge from data listed above, if the temperature of ethanol solution increased by an additional 10 degrees, what would happen? Construct a line graph is required as well.

Solubility is the ability to dissolve certain substances(solutes) into a solvent. You are a student in Mrs. Bateast's Chemistry class and you were given the assignment to compare solubilities of salt in different solvents at different temperatures. You added salt at a consistent rate and amount until you reached the point of full saturation. The amount added to each solvent at saturation was recorded. The results of the experiment are shown in the tables: Table 1: 20 °C Mass of Salt at Saturation 43 g 38 g 0.01 g 3 g Solvent Water Ethanol Hexane Dichloromethane Table 2: 35 °C Solvent Water Ethanol Mass of Salt at Saturation 52 g 45 g 0.02 g 4g Нехane Dichloromethane Using CER and your knowledge from data listed above, if the temperature of ethanol solution increased by an additional 10 degrees, what would happen? Construct a line graph is required as well.

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

HNO3(aq)+Mg(OH)2(s)→HNO3(aq)+Mg(OH)2(s)→   Express your answer as a chemical equation. Identify all of the phases in your answer.

Calculate the concentration of copper(II) chloride contaminant in the original groundwater sample. Round your answer to  2  significant digits.

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.

Solving for a reactant in solution. Dimensional analysis.

The label on a bottle of “organic” liquid fertlizer concentrate states that it contains 7.40 grams of phosphate per 100.0 mL and that 16.0 fluid ounces should be diluted with water to make 32.0 gallons of fertilizer to be applied to growing plants. What is the phosphate concentration in grams per liter in the diluted fertilizer? (1 gallon= 128 fluid ounces)