Some Basic Concepts Of Chemistry Question 248

Question: The amount of water that should be added to 500 ml of 0.5 N solution of $ NaOH $ to give a concentration of 10 mg per ml is

Options:

A) 100

B) 200

C) 250

D) 500

Show Answer

Answer:

Correct Answer: D

Solution:

$ N _1=0.5N\to 10mg\ per\ mL $

$ N _2=\frac{10\times {10^{-3}}gm}{40\times 1}\times 1000 $ =0.25N $ V _1=500ml $ , $ V _2=? $

$ N _1V _1=N _2V _2 $ ; $ 0.5\times 500=0.25\times V _2 $

$ V _2=1000mL $ final volume water added = 1000 ­? 500 = 500mL.



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