Asolution has a ph of 4.20. using the relationship between ph and poh, what is the concentration of oh−?

a.

9.9 × 10-1 m

b.

6.2 × 10-1 m

c.

6.3 × 10-5 m

d.

6.7 × 10-6 m

e.

1.6 × 10-10 m

E. 1.6 x 10⁻¹⁰ M.

Explanation:

∵ pH = -log[H⁺] = 4.2

∴ [H⁺] = 6.31 x 10⁻⁵.

∵ [H⁺] [OH⁻] = 10⁻¹⁴.

∴ [OH⁻] = 10⁻¹⁴ / [H⁺] = 10⁻¹⁴ / 6.31 x 10⁻⁵ = 1.6 x 10⁻¹⁰ M.

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

24

0.88m hope i am correct : )