Question

what will be the molarity of solution containing 7.4 g of Ca(OH)2 in 500 ml of solution.

Answer 1

moles of ca(oh)2/0.5Litre

Answer 2

Answer:

The molarity of the solution is 0.2M

Explanation:

Given that,

The mass of Calcium Hydroxide is 7.4gm

$= > m = 7.4gm$

We know that,The molar mass of calcium hydroxide is 74gm.Therefore,number of moles if Ca(OH)2 is

$n=\frac{m}{M}$

Substituting the known masses we get

$n = \frac{7.4}{74} = 0.1 \: mole$

Also given that,the volume of the solution is 500ml

$= > V=0.5L$

Now the Molarity of solution is calculated using relation

$M=\frac{n}{V(in L)}$

Substituting known values,we get

$M=\frac{0.1}{0.5} = 0.2M$

Therefore,The molarity of the solution is 0.2M

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