You have a 1.212 M stock aqueous solution of Sr(OH)2. What volume of thestock solution (in mL) must be diluted with water to prepare 50.00 mL of a solutionthat has a hydroxide concentration [OH–] = 0.2000 M?

The volume of stock solution of strontium hydroxide needed is 4.125 mL

Explanation:

1 mole of produces 1 mole of strontium ions and 2 moles of hydroxide ions

Molarity of diluted strontium hydroxide solution =

To calculate the molarity of the diluted solution, we use the equation:

where,

are the molarity and volume of the concentrated strontium hydroxide solution

are the molarity and volume of diluted strontium hydroxide solution

We are given:

Putting values in above equation, we get:

Hence, the volume of stock solution of strontium hydroxide needed is 4.125 mL

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