Please help You need to prepare 5.00 L of an aqueous solution having a pH =...

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science chemistry

Answer 1

Answer #1

The Ca(OH)₂ solution has a pH of 12.50, this means that the pOH is:
pOH = 14-12.5 = 1.5
[OH^-] = 10^-1.5 = 0.0316 M

Now, that we know this, we know that the solution is dissolved this way:
Ca(OH)₂ <--------> Ca²⁺ + 2OH^-

This means that to get the concentration of Ca(OH)₂:
[Ca(OH)₂] = 0.0316 / 2 = 0.0158 M

the moles and then mass:
moles = 0.0158 mol/L * 5 L = 0.079 moles
mass = 0.079 moles * (40+32+2) = 5.846 g needed to prepare this solution.

The other question post it in another question thread :). Hope this helps

Answer 2

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