Single Choice

1%(w/v) of an aqueous solution of NaOH is isomolar with:

A1M $${ H }_{ 2 }{ SO }_{ 4 }$$
B$$0.1M\ NaCl$$
C$$0.5M \ KOH$$
D$$0.25 M \ HCl$$
Correct Answer

Solution

1%(w/v) of an aqueous solution means 1 gm $$NaOH$$ present in 100 ml solution.

$$Molarity =\dfrac{1}{40}\times \dfrac{1000}{100}$$

$$=0.25 M$$

Isomolar means molarity should be the same.

$$\therefore$$ Option [D] has the same molarity as 1% of an aqueous solution of NaOH.

Hence, final Answer is 0.25 M HCl.

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