Question

If 2 gm Na OH is dissolute in water to make solution upto 250 cc. Give molarity of the solution

Answer 1

Answer:0.2M

Explanation:

Moles of NaOH: given mass/molar mass= 2/40=1/20 = 0.05

Volume of solvent=250cc = 250ml [1cc=1ml]

250ml = 0.25 Litre

Molarity=no of moles/ volume of solvent in litres

Hence Molarity = 0.05 / 0.25 = 0.2M (Ans)

Answer 2

Answer:

here is your answer,

Explanation:

it is given that 2gm NaOH is dissoluted in water to make solution upto 250 cc i.e.250 cm³or 250 ml.

now, in 250ml solution there is 2 gm NaOH.

   or,in 250 ml solution there is( 2/40=1/20 ) mole of NaOH

then, in 1000ml solution there will be(?) mole NaOH

so, by unitery method we get molarity(M) as,

(1000*1/20)/250=0.2M