25.4 grams of Pottasium Hydroxide pellets were dissolved in 25ml of water. calculate the molarity of the solution.
Answers
Explanation:
Here, 25.4g of KOH pellets are dissolved in 25ml of water
.
. . MOLARITY= number of moles of
solute
-----------------------------------
Volume of solution (in L)
but here no of moles is not given so we will find no of moles of solute 1st
no of moles of KOH= given mass÷ molar mass of KOH
= 25.4÷18+16+1 = 25.4÷35
.
. . MOLARITY= 25.4÷35
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25÷1000( since we have to find volume in litres)
= 25.4 1000
-------- * ---------
35 25
= 29.02M
