Find normality and molarity of an unknown solution of phosphoric acid if 12.0 mL

Question

Find normality and molarity of an unknown solution of phosphoric acid if 12.0 mL of 0.2 N sodium hydroxide is required to completely titrate a 20.0 mL sample of unknown phosphoric acid. Find normality and molarity of an unknown sample of a barium hydroxide solution if 30.0 mL of 0.12 N hydrochloric acid is required to titrate a 24.0 mL sample of barium hydroxide. Find the mass of silver chloride precipitate formed when 20.0 mL of 0.2 M sodium chloride is mixed with 50.0 mL of 0.05 M solution of silver nitrate.

Explanation / Answer

2)

1 ---> Ba(OH)2

2---> HCl

use:

N1*V2 = N2*V2

N*24 = 0.12*30

N = 0.15 N

1 mol of Ba(OH)2 gives 2 mol of OH-

M = N/2= 0.15/2= 0.075 M

Answer:

Normality = 0.15 N

Molarity = 0.075 M

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