What of the following is true if the pH of a solution decreases?
[H+] increases
[OH-] increases
Kw increases
Kw decreases
None

[H⁺] increases

Explanation:

What of the following is true if the pH of a solution decreases?

The pH and the [H⁺] are related through the following expression.

pH = -log [H⁺]

According to this, there is an inverse relation between the pH and the [H⁺]. When the pH decreases, the [H⁺] increases.

The [H⁺] and the [OH⁻] are inversely related through the following expression.

[H⁺] × [OH⁻] = Kw

As we saw, when the pH decreases, the [H⁺] increases. Then, the [OH⁻] decreases.

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