Question

40 gm of NaOH is dissolved in 500ml solution find molarity ​

Answer 1

Answer:1.90

Explanation:

Molarity = given weight / molecular weight * 1000/ volume in ml. So , 40/42 * 1000/500 = 1.90

Answer 2

40 gm NaOH dissolved in 500 ml of solution has 2 M of molarity.

Explanation:

Given: 40 gm of Naoh dissolved in 500ml

To find: The molarity of the given solution

Solution:

Molarity

The amount of a material in a specific volume of solution is known as its molarity. In a litre of solution, it is the number of moles of solute. Hence, also known as the solution's molar concentration.

As a result, molarity is the ratio of the solute's molecular weight to the solution's volume, especially its volume in litres. The unit is written as "M." (moles per litre).

Molarity = n /V

where

n = number of moles of solute

V = volume of solution

Number of moles of solute is expressed as ratio of given mass of solute to the molar mass of the same.

$n = \frac{m_{given} }{m_{molar} }$

mass of Naoh = 40 gm

Volume of solution = 500 ml = 0.5 litres

molar mass of Naoh = 40gm/mp;

Number of moles of Naoh = $\frac{40}{40 gm / mol} = 1 moles$

Molarity is given as,

$Molarity = \frac{1 moles}{0.5 litres} = 2 M$

Final answer

Therefore, 40 gm NaOH dissolved in 500 ml of solution has 2 M of molarity.

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