You visited us 1 times! Enjoying our articles? Unlock Full Access!

Byju's Answer

Standard XII

Chemistry

Auto Protolysis of Water

50 g of sampl...

Question

50 g of sample of $C a (O H)_{2}$ is dissolved in 50 ml of 0.5 N HCl solution. The excess HCl was titrated with 0.25 N NaOH solution. The volume of NaOH used was 20 ml. What is % purity of $C a (O H)_{2}$ in the sample?

Open in App

Solution

$C a (O H)_{2} + 2 H C l \to C a C l_{2} + 2 H_{2} O$ and $N a O H + H C l \to N a C l + H_{2} O$
meqv. of HCl in 50 ml of 0.5 N HCl solution= 25 meqv.
meqv. of NaOH in 20 ml of 0.25 N NaOH solution= 5.0 meqv.
So, meqv. of HCl used to react $C a (O H)_{2} = 25 - 5 = 20 m e q v .$
So. meqv. of $C a (O H) 2 = 20 m e q v$
So, mmol. of $C a (O H)_{2} = \frac{20}{2} = 10 m m o l$
So, mass of $C a (O H)_{2}$ in sample $= 10 \times 74 m g = 740 m g$
So, % purity of $C a (O H)_{2}$ in sample $= \frac{0.740}{50} \times 100 = 1.48 %$

Suggest Corrections

Similar questions

50

g of a sample of

C a {(O H)}_{2}

is dissoved in

50

mL of

0.5 N

H C l

solution. The excess of

H C l

was titrated with

0.3 N N a O H

. The volume of

N a O H

used was

20

cc. The percentage purity of

C a {(O H)}_{2}

is:

Q. 50 gm of a sample of

C a ({O H}_{2})

is dissolved in 50 ml of 0.5 N HCI solution. The excess of HCI was titrated with

0.3 N N a O H

. The volume of NaOH used was 20cc. Calculate % purity of

C a ({O H}_{2})

Fill your answer as sum of digits (excluding decimal places) till you get the single digit answer.

Q. 20 g a sample of

B a (O H)_{2}

is dissolved in 10 mL of 0.5 N HCL solution: The excess of HCL was titrated with 0.2 N NaOH. The volume of NaOH used was 20 cc. Calculate the percentage of

B a (O H)_{2}

in the sample.

20 g

of a sample of

B a (O H)_{2}

is dissolved in

10 m L

0.5 N H C l

solution. The excess of

H C l

was titrated with

0.2 N N a O H .

The volume of

N a O H

required was

10 m L

. Calculate the percentage of

B a (O H)_{2}

in the sample.
(Given molar mass of

B a

137 g m o l^{- 1}

)

20 g

of a sample of

B a (O H)_{2}

is dissolved in

10 m L

0.5 N H C l

solution. The excess of

H C l

was titrated with

0.2 N N a O H .

The volume of

N a O H

required was

10 m L

. Calculate the percentage of

B a (O H)_{2}

in the sample.
(Given molar mass of

B a

137 g m o l^{- 1}

)

Join BYJU'S Learning Program

50 g of sample of Ca(OH)2 is dissolved in 50 ml of 0.5 N HCl solution. The excess HCl was titrated with 0.25 N NaOH solution. The volume of NaOH used was 20 ml. What is % purity of Ca(OH)2 in the sample?

50 g of sample of $C a (O H)_{2}$ is dissolved in 50 ml of 0.5 N HCl solution. The excess HCl was titrated with 0.25 N NaOH solution. The volume of NaOH used was 20 ml. What is % purity of $C a (O H)_{2}$ in the sample?