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Chemistry Forums for Students => Undergraduate General Chemistry Forum => Topic started by: sector9tahiti on October 11, 2008, 11:01:46 AM

Title: Acid Base Equilibria
Post by: sector9tahiti on October 11, 2008, 11:01:46 AM

Calculate the hydrogen ion concentration and the pH of the solution formed when .020M of nitric acid is added to one liter of aqueous .20M ammonia solution. Assume no significant volume change upon addition of the acid.

Title: Re: Acid Base Equilibria
Post by: Borek on October 11, 2008, 02:16:43 PM

Done. What now?

Please read forum rules (http://www.chemicalforums.com/index.php?page=forumrules).

Title: Re: Acid Base Equilibria
Post by: sector9tahiti on October 12, 2008, 02:47:52 PM

how do you find the hydrogen ion concentration and pH? Thats all i need.

Title: Re: Acid Base Equilibria
Post by: Borek on October 12, 2008, 04:46:36 PM

THis is buffer question and you need to use Henderson-Hasselbalch equation (http://www.chembuddy.com/?left=pH-calculation&right=pH-buffers-henderson-hasselbalch).

Title: Re: Acid Base Equilibria
Post by: sector9tahiti on October 12, 2008, 08:24:10 PM

so if i use that equation am i suppose to get pH= 10.26 and [H⁺] = 5.5x10^-11

Title: Re: Acid Base Equilibria
Post by: Borek on October 13, 2008, 02:46:34 AM

Quote from: sector9tahiti on October 12, 2008, 08:24:10 PM

pH= 10.26

Close. What pKa (or pKb) value do you use?