When taking pH measurements of solutions, why is it important to stir thoroughly after adding each reagent? Select one:
A. Mixing helps ensure that the measured pH is reflective of the entire solution.
B. Mixing helps keep the solution components from contaminating the pH meter.
C. Mixing helps prevent precipitation of insoluble salts out of solution.
D. A pH meter can only measure ions that are flowing past the meter at a fast speed.

answer; capital earns interest; entrepreneurship receives a profit or incurs a loss;

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o