Calculate the ph of solutions containing the following a...

Calculate the pH of solutions containing the following: a) 0.005 M HCl b) one litre of 0.5M leucine buffer (pH 9.6) to which is added one litre of 0.1 M NaOH c) 500 mL of 0.6 M H3PO4 plus 500 mL of 0.4 M KH2PO4 (pKa's for phosphate: 2.14,6.86, 12.4) d) What is the total phosphate concentration in the buffer from part c)?

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00:01 Hello there.

00:01 I see that you have a question on how to calculate ph of solutions containing the four followings that we see right in front of us.

00:11 So let's start with the first one.

00:12 So they want us to find the ph in 0 .005 molarity of hydrochloric acid.

00:23 Oh, drop something on my end.

00:26 Sorry.

00:27 Okay.

00:28 So how we go about this is so i set up like where you balance out the equation and then we set up where the hydrogen equals the hydrochloric acid which is also which is equal to 0 .05 i mean 0 .005 molarity.

00:49 So then we write up the set up for the ph on how to solve it.

00:53 Plug it in and that's how we get the ph for the first one.

00:57 The second one, they want to find us to calculate the ph of the solutions where one litre of 0 .5 molarity of lucene buffer, which has a ph of 9 .6, 2 which is added 1 litre of 0 .1 molarity of sodium hydroxide of sodium hydroxide.

01:30 So how we go about this is that we calculate where we have our weak acid above our weak base.

01:40 And that's our total right there.

01:43 Then same thing.

01:46 Plug it in and i don't know why i keep accidentally writing on it.

01:51 And this is the answer that you will get...

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