Question

In a volumetric experiment, 25.0 cm3 of 0.100 mol / dm3 sodium hydroxide reacts exactly with 20.0 cm3 of sulfuric acid. 2NaOH + H2SO4 → Na2SO4 + 2H2O What is the concentration of the sulfuric acid?

Answer 1

Answer:

0.0635 mol / dm3

Explanation:

use the formula n = cv , n = mol, c = concentration , v = volume

STEP 1 :25/1000= 0.025dm3

n = 0.025dm3 * 0.100 mol / dm3

n= 2.5 x 10^-3

        STEP 2:  molar ratio

     2NaOH = H2SO4

2.5 x 10^-3 =     xH2SO4

1.25 x 10^-3 mol of sulfuric acid

STEP 3:     n = cv

C = N/V

c= 1.25 x 10^-3 /(20 / 1000)

0.0625 mol/ dm3

                   

Answer 2

Answer:

0.0625mol/dm³

Explanation:

in solving such question only becareful about number of moles