(=2 7. A solution of potassium permanganate was used to titrate a 15.00 mL aliquot of 0.1942 M H₂O2, and the endpoint was determined to be at 42.37 mL. What is the molarity of the potassium permanganate solution?

3

it's homework not exam

After creating her standard curve for absorption versus the concentration (M) of FD&C Red 40 and processing her data, Sally found that her drinking strength Kool-Aid sample had a concentration of 4.692 x 10–5 M. If 0.132 grams of Kool-Aid powder was used to prepare an 8-fl oz cup of her assigned flavor, what is the percent by mass of FD&C Red 40 in her Kool-aid powder? Report your answer as a percentage with two places after the decimal. Do not include the percentage sign in your answer. Pay attention to units. You are trying to find the mass percentage of red dye, so you need to know each variable in the equation in Appendix B. Note that the percent by mass equation should be multiplied by 100. There may be some useful conversion factors in the experimental procedure.

14-15

When the math expression below is simplified, how many sig figs should the result have? 91.69-90.98 6.35 + 4.44 4 3 O 2 0 1

6- He JOu Ho Culor

Asnwer is 0.81

1a. Throughout the experiment, what are some possible sources of error that could have led to someone recovering a significantly smaller amount of table salt (NaCI) than was originally present in the sample mixture. 16. What are some possible sources of error that could have led to someone to appear to have recovered a significantly larger amount of sand (SiO2) than was originally present in the sample mixture.

Determine the pH of each of the following solutions.