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Straighterline General Chemistry 1 LAB CHEM101L Lab 7 Precipitation Reactions COMPLETE Worksheet with LAB PHOTOS (New Version August 2024) Scored 100%R195,18
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Lab 7 Precipitation Reactions CHEM101L
Straighterline Intro to Chemistry CHEM101L Lab 7 Precipitation Reactions COMPLETE
Worksheet with LAB PHOTOS (New Version August 2024) Scored 100%
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Lab Report Format Expectations
Utilize college level grammar and professional formatting when completing this worksheet.
Report all equations in a proper mathematical format, with the correct signs and symbols.
Pre-Lab Questions
1. What is percent yield and why is percent yield important to the field of chemistry?
A chemical reaction's efficiency is gauged by contrasting the actual yield of a product to its
predicted value, which is known as the percent yield. It is computed by multiplying the actual
yield by 100% and dividing it by the theoretical yield. In chemistry, percent yield is crucial for
evaluating economic feasibility, maximizing resource use, optimizing reactions, and analyzing
reaction efficiency. A high yield percentage denotes efficient reactions, whereas a low yield
percentage denotes inefficiencies.
2. What information would you need to calculate a percent yield?
The actual yield and theoretical yield. The ratio of actual yield to theoretical yield is multiplied
by 100 to get the percent yield.
3. Research some common precipitation reactions online and list two, here.
AgNO3(aq) + KCl(aq) —–AgCl(s) + KNO3(aq)
AgNO3(aq) + NaCl(aq) —- AgCl↓ + NaNO3 (aq)
4. Why is atomic mass significant to calculating percent yield?
The atomic mass unit can quantify an atom's mass and calculate its number of moles. One must
first determine the number of moles to compute the percent yield.
, Lab 7 Precipitation Reactions CHEM101L
EXPERIMENT 1: TESTING FOR THE CALCIUM ION
Introduction Questions
1. In this experiment, you will test to see if the calcium ion is present in solution. How will you
know if this is the case?
When oxalate ions are added, a white precipitate forms, and in a flame test, the solution turns
red, indicating the presence of calcium ions.
2. Under what conditions do precipitates form during a chemical reaction?
When the concentration of a dissolved material is greater than its solubility, a precipitate is
formed. This can happen when two solutions containing ions react to generate an insoluble
compound and are mixed when the temperature or pH of the solution is changed.
3. What chemicals do you add to the test tube in Step 1 and Step 2 of this experiment?
a. Step 1: Sodium Fluoride (NaF)
Step 2: Calcium Acetate (Ca(C2H3O2)2)
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