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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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smithj8787 smithj8787
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Posts: 21
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11 years ago
What is the approximate pH at the equilivance point of a weak acid strong base titration if 25 mL of aqueous hydroflouric acid requires 30.00 mL of 0.400 M NaOH?
Ka = 6.76 x 10^-4 for HF?
1.74
5.75
8.25
12.26
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wrote...
#1
11 years ago
4-5
wrote...
#2
11 years ago
If the numbers in your additional details are your possible answers, then it would be 8.26.

The way I think of these being: if we start off with a weak acid, its pH is probably around 4-6. When we add a strong base, it's pH will increase, however it won't increase largely, so it will probably fall around 8-9.
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