Question

At 25°C, the following data were collected:

Solution A: pH = 8.46
Solution B: pOH = 9.30
Solution C: [H+] = 2.5 × 10-4 M
Solution D: [OH-] = 1.1 × 10-10 M
Which lists the solutions in order of increasing acidity?
a. C < D < A < B
b. B < A < D < C
c. A < B < D < C
d. A < B < C < D

Answer 1

Answer: A< B< D< C

Step-by-step explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration.

`pH=-\log [H^+]`

`pOH=-\log[OH^-]`

Lower is the
`H^+` , higher is the acidity.

a. Solution A: pH = 8.46

Putting in the values:

`8.46=-\log [H^+]`

`[H^+]=3.47* 10^(-9)M`

b. Solution B: pOH = 9.30

`9.30=-\log [OH^-]`

`[OH^-]=5.01* 10^(-10)M`

`[H^+][OH^-]=10^(-14)`

`[H^+]=(10^(-14))/(5.01* 10^(-10))=0.20* 10^(-4)`

c. Solution C:
`[H^+]=2.5* 10^(-4)`

d. Solution D:
`[OH^-]=1.1* 10^(-10)`

`[H^+][OH^-]=10^(-14)`

`[H^+]=\frac{10^(-14)}[1.1* 10^(-10)}=0.91* 10^(-4)`

Thus the order of increasing acidity is A< B< D< C