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Chemistry Forums for Students => Organic Chemistry Forum => Topic started by: helper on November 22, 2013, 01:57:29 PM

Title: ph calaulations
Post by: helper on November 22, 2013, 01:57:29 PM

hello,
I had to calculate the pH of a mixture of 5ml of 4M-HCl.
and I got that the pH is negative, how can explaine?

Title: Re: ph calaulations
Post by: Borek on November 22, 2013, 02:46:03 PM

What is there to explain? pH can be negative, it doesn't have to be positive.

BTW, would the result be different for a 3 mL sample of the same acid?

Title: Re: ph calaulations
Post by: zsinger on November 22, 2013, 04:29:41 PM

Ka has NOTHING to do with how much volume exists, but the concentrations of reactants and products.  3mL of 5N HCL has the same Ka as 2,000 mL of 5N HCL.

Title: Re: ph calaulations
Post by: Borek on November 22, 2013, 05:02:50 PM

Quote from: zsinger on November 22, 2013, 04:29:41 PM

Ka has NOTHING to do with how much volume exists, but the concentrations of reactants and products.  3mL of 5N HCL has the same Ka as 2,000 mL of 5N HCL.

1. Ka has nothing to do with the problem.

2. Question was not directed to you, but to the OP.