Prepare 6 calibration solutions in medium test tubes using 1 and 5 ml graduated
ID: 553245 • Letter: P
Question
Prepare 6 calibration solutions in medium test tubes using 1 and 5 ml graduated pipettes.
Calibration Solution
0.00025M Bromothymol Blue (mL)
0.010 M HCl (mL)
C1
1.00
4.00
C2
0.70
4.30
C3
0.50
4.50
0.00025M Bromothymol Blue (mL)
0.010 M NaOH (mL)
C4
1.00
4.00
C5
0.70
4.30
C6
0.50
4.50
Prepare 5 standard solutions in medium test tubes using 1 and 5 ml graduated pipettes.
Solution 0.00025M 0.10M 0.10M
Bromothymol blue (mL) K2HPO4 (mL) KH2PO4 (mL)
-----------------------------------------------------------------------------------------------------------------------------------------------------------
S7 1.00 4.00 0.00
S8 1.00 3.00 1.00
S9 1.00 2.00 2.00
S10 1.00 1.00 3.00
S11 1.00 0.00 4.00
--> If the solution reads pH 7.66, calculate the [H+1] eq ?
Calibration Solution
0.00025M Bromothymol Blue (mL)
0.010 M HCl (mL)
C1
1.00
4.00
C2
0.70
4.30
C3
0.50
4.50
0.00025M Bromothymol Blue (mL)
0.010 M NaOH (mL)
C4
1.00
4.00
C5
0.70
4.30
C6
0.50
4.50
Explanation / Answer
[H+1] is nothing but [H+] hydrogen ion concentration, it is calculated from equilibrium only hence we use [H+]eq
we know pH = -log[H+]
==> [H+] = 10-pH
[H+] = 10-7.66 = 2.18776162e-8
[H+] = 2.2 x 10-8 ----------------required answer
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