Question

2.8 g of KOH is dissolved in water to give 200 cm^3 of Solution. Calculate the molarity of this solution. [1cm^3 = 1ml]
Solve please

Answer 1

Hence answer will be 0.25M

Answer 2

Answer:

Concept:

The number of moles of a solute in one liter of solution is measured by the concentration unit known as molarity. The approach to resolving molarity issues is quite straightforward. This describes an easy way to figure out how molarity of a solution.

Explanation:

By converting the  200 cm^3 into liters.

200 cc = 200 mL = 0.200 L

A 1 molar solution is a solution in which 1 mole of a compound is dissolved in a total volume of 1 liter.

Solving for the number of moles in 2.8 g of KOH.

The molar mass of KOH will be

K = 39 O = 16 H = 1 Molar mass of KOH = 56 g

2.8 g / 56 g per mole = 0.05 moles

If 0.05 moles of KOH is dissolved in 0.200 L of water we get 0.05 moles / 0.200 L >>>> 0.25 moles / liter

So 2.8 g of KOH in 200 mL solution is 0.25 molar solution

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