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.
