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Chemistry Forums for Students => Physical Chemistry Forum => Topic started by: oscillate_wildly on August 05, 2009, 11:14:45 AM

Title: Buffer solutions - Calculate the concentration of H3O+
Post by: oscillate_wildly on August 05, 2009, 11:14:45 AM

A buffer solution is prepared by mixing 150 mL of 0.15 M NaF and 65 mL of 0.030 M
HF. Calculate the concentration of H3O+ (given Ka for  HF  = 7.2 × 10–4) [14 marks]

I have no idea how to do this or where to start. Any help will be greatly appreciated. Thanks.

Title: Re: Buffer solutions - Calculate the concentration of H3O+
Post by: plankk on August 06, 2009, 01:42:01 AM

Do you know the Henderson–Hasselbalch equation? It will be useful here.

Title: Re: Buffer solutions - Calculate the concentration of H3O+
Post by: oscillate_wildly on August 06, 2009, 06:03:00 AM

Nope I don't think I do. Is that the only equation I need to apply to this? Thanks.