Question

Find molarity of 10% w/v by volume NaoH solution

Answer 1

Hey there !!
Here is your solution:

10% (w/v) => 10 g in 100 ml of water
Molar mass of NaOH = 23 + 16 + 1 = 40g
Molarity = ?

Formula for finding molarity = Number of moles/Volume of solution in litres
= Given mass/ Molar mass * 1000/Volume of solution in ml
= 10/40 * 1000/100
= 10/4
= 2.5 M
Therefore, molarity = 2.5M

Hope this helps ya ✌️✌️

Answer 2

Molarity means number of moles of solute is dissolved in 1000ml water.

10%(w/v) means 10g of NaOH is dissolved in 100 ml of water.

1moles of NaOH =(23+16+1) = 40g

40g NaOH in 1000ml of water = 1M soln

10g NaOH in 1000ml of water = 1/4 M soln

10g NaOH in 100ml of water = (1/4)*10 M soln = 2.5M

Therefore, the molarity of 10%(w/v) NaOH soln is 2.5