The [h3o+] of a solution is 2.5 x10-7. what is the poh of the solution?

7.4.

Explanation:

∵ pH = -log[H₃O⁺].

∴ pH = -log(2.5 x 10⁻⁷) = 6.6.

∵ pH + pOH = 14.

∴ pOH = 14.0 - pH = 14.0 - 6.6 = 7.4.

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