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17 Jul 2009, 12:27 PM
| #1 (permalink) |
| Assistant Member HSC: 2009 Gender: Female Location: Wambi
Join Date: May 2008
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15 Nov 2009, 7:38 PM  |  multiple choice question-PH? You can hide this advertisement by registering. A sulfuric acid solution has a concentration of 5 x 10^-4 mol L^-1What is the pH of this solution, assuming the acid is completely ionised? a) 3.0 b) 3.3 c) 3.6 d) 4.0 Using the calculator and -log(5 x 10^-4) the answer is 3.3 however the answer is actually a) not sure why, is it something to do with a decimal place rule? Thanks
__________________  Mathematics. Maths Ext 1. English Advanced. Eng Ext 1. Modern History. Ancient History. Chemistry. |
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17 Jul 2009, 12:31 PM
| #2 (permalink) |
| Divine Member  HSC: 2009 Gender: Male Location: Wherever you're not.
Join Date: Mar 2007
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Yesterday, 11:32 PM   | Re: multiple choice question-PH? Sulfuric acid is diprotic hence you have to double the actual concentration to get the hydrogen ion concentration. So the hydrogen ion concentration is 10-3.
__________________ HSC subjects: Extension 2 Mathematics | Advanced English | Physics | Chemistry | Studies of Religion I  |
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17 Jul 2009, 12:52 PM
| #3 (permalink) |
| Assistant Member HSC: 2009 Gender: Female Location: Wambi
Join Date: May 2008
Posts: 92
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15 Nov 2009, 7:38 PM | Re: multiple choice question-PH? ohhh yer. I thought I must have been missing something. I forgot about that Thanks heaps
__________________ Mathematics. Maths Ext 1. English Advanced. Eng Ext 1. Modern History. Ancient History. Chemistry. |
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