Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added

QuestionsCategory: ChemistryCalculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added
Lisa Howell asked 5 months ago
Calculate the pH of the resulting solution if 30.0 mL of 0.300 M HCl(aq) is added to
(a) 35.0 mL of 0.300 M NaOH(aq).
(b) 40.0 mL of 0.350 M NaOH(aq).

3 Answers
Lisa Howell answered 5 months ago
I will do one.

first: moles HCL=.030*.3=.009 moles
moles base=.035*.3=.015 moles

so you have excess of .006 moles OH

pOH= -log (.006/.65)
then pH= 14-pOH

Lisa Howell answered 5 months ago
Why did you divide by .65?

Lisa Howell answered 5 months ago
Wait so, you are getting 0.65 from the total mL but shouldnt this be 65/1000 or 0.065?

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