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Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide as per Pharmacopia? Whether it means the formula for calculating molarity was wrong? 

Answers were Sorted based on User's Feedback



Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide ..

Answer / phani kumar

In 1molar NaOH solution we take 42gms NaOH in 1000ml water.why because NaOH pellets having 97% purity

Is This Answer Correct ?    27 Yes 6 No

Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide ..

Answer / jilajeet yadav

Because 2% calcium carbonat impurities

Is This Answer Correct ?    4 Yes 0 No

Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide ..

Answer / pravin admane

If Sodium hydroxide having 97 % purity then obtained wt is 41.2 not 42 gm

Is This Answer Correct ?    3 Yes 0 No

Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide ..

Answer / zepher agiza

Water of crystallization compensation

Is This Answer Correct ?    0 Yes 0 No

Why we have to take 42gm of sodium hydroxide instead of 40gm for preparation of 1M Sodium hydroxide ..

Answer / ashok kumar

In 1molar NaOH solution we take 42gms NaOH in 1000ml water.why because NaOH pellets having 100% purity

Is This Answer Correct ?    0 Yes 15 No

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