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12.29d

Posted: Mon Dec 04, 2017 11:08 pm
by Jessica Lutz 2E
Calculate the pH and pOH of each of the following aqueous solutions of strong acid or base:
(d) 2.00 mL of 0.175 m KOH(aq) after dilution to 0.500 L
I understand the concept of finding pH and pOH but I am stuck on this question because I do understand how they got the molarity for the dilution. In the solutions manual they did (2.00ml/500ml)*.175mol/L to get the new molarity. I am confused about how this follows the rules of molarity.

Re: 12.29d

Posted: Tue Dec 05, 2017 12:55 am
by Chem_Mod
This basically used M1V1 = M2V2. New concentration is M2 = M1V1/V2. V1/V2 represents your 2.00/500. M1 would be 0.175.

Re: 12.29d

Posted: Tue Dec 05, 2017 7:36 pm
by Yizhou Liu 3L
You need to use the formula M1V1=M2V2 to get the new concentration of KOH, which also equals to the concentration of OH- because KOH is a strong base.