[Win,odd Dhamnekar]

1)A lab technician mixes a solution of 0.015 M Mg(OH)₂. Is the resulting (OH)⁻ concentration greater than, equal to, or less than 0.015 M? If yes, why? If no, why?

2)A lab technician mixes a solution of 0.55 M HNO₃. Is the resulting (H⁺) concentration greater than, equal to, or less than 0.015 M? If yes, why? If no, why?

My answer:

1) The ionization equation is Mg(OH)₂⇌ Mg⁺ + 2(OH)⁻ . So, resulting OH⁻ concentration is greater than 0.015 M because there are two OH⁻ ions per formula unit of Mg(OH)₂

2)This ionization equation is HNO₃ ⇌H⁺ + NO₃⁻ So, resulting H⁺  ions concentration  is equal to 0.55 M.

Are my both answers correct?

[Borek]

A lab technician mixes a solution of 0.015 M Mg(OH)₂

No way to make such a solution, check Mg(OH)₂ solubility.