Homework Help: chem101

Posted by justin on Monday, April 5, 2010 at 5:52am.

50.0ml of 0.10M HCL{aq} was added to 40.0ml of 0.10M NaOH{aq} and the mixture was stirred,then tested with a pH meter.What reading should be obtained for pH at 25.0degrees celcias?

chem101 - DrBob222, Monday, April 5, 2010 at 11:13am
HCl + NaOH ==>NaCl + H2O

moles HCl to start: M x L = 0.050 x 0.10 = 0.005 moles HCl.
moles NaOH to start: M x L = 0.040 x 0.1 = 0.004 moles NaOH.

All of the NaOH is used. We have 0.005-0.004 moles = 0.001 moles HCl remain unreacted (HCl) = 0.001 moles/0.100 L = 0.01 M HCl.

Since HCl is a strong acid, it ionizes 100%; therefore, (H^+) = 0.01 and the pH is ??
Check my work.
chem101 - SAM, Thursday, April 8, 2010 at 7:45am
1.95
chem101 - SAM, Thursday, April 8, 2010 at 7:55am
PH=-log[0.01]=1.95

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