question number 12 about sulfuric acid. please explain the steps clearly to solv

Question

question number 12 about sulfuric acid. please explain the steps clearly to solve the problem.

What is the concentration of the Ca(OH)2 in %(m/v)? What is the concentration of the Ca(OH)2 in %(w/w)? 12) In la you plan on using an aqueous solution of sulfuric acid (H2SO4) as part of an experiment But when you go to the stockroom, the only sulfuric acid solution there is 18.0M. Realizing that 18.0M sulfuric acid can bum a hole in someone's leather shoes as well as not being friendly to inhale, you decide it would be safer to make a 4.50M solution. At that concentration, the lab will require 200.0ml of the working (more dilute) solution. To make the solution, how much 18.0M sulfuric acid is required?

Explanation / Answer

number of moles of sulphuric acid remains same after dilution => no. of moles of Sulphuric acid in 18 M solution will remain same even after added water to it .. Now we want 200 ml of 4.5 M solution Molarity = No. of moles / Volume (in litres) => No. of moles in the required solution = 0.2 L x 4.5 M = 0.9 moles We need to have 0.9 moles in the 18 M solution Let us take V litres of 18 M solution Then 0.9 = V x 18 V = 50 ml We require 50 ml of 18 M solution

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