# Chemistry Worksheet

Question 12 of 15 >Attempt 1
A 0.4560 g sample of a pure carbonate, X,CO3(s), was dissolved in 50.0 mL of 0.1700 M HCl(aq). The excess HCl(aq) was
back titrated with 23.70 mL of 0.0980 M NaOH(aq).
How many moles of HCl react with the carbonate?
moles of HCI
mol
What is the identity of the cation, X?
+
cation: Ca2+
Question 13 of 15
>
Attempt 1
A 50.0 mL solution of 0.127 M KOH is titrated with 0.254 M HCl. Calculate the pH of the solution after the addition of each
of the given amounts of HCl.
0.00 mL
pH =
13.10
7.00 mL
pH =
12.90
O
12.5 mL
pH =
12.71
20.0 mL
pH =
24.0 mL
pH =
11.54
25.0 mL
pH = 7.00
26.0 mL
pH =
2.48
29.0 mL
pH =
Question 14 of 15
>
Attempt 1
Calculate the pH for each of the cases in the titration of 25.0 mL of 0.100 M pyridine, CHEN(aq) with 0.100 M HBr(aq).
A. before addition of any HBr 9.12
B. after addition of 12.5 mL of HBr 5.24
C. after addition of 23.0 mL of HBr
4.637
D. after addition of 25.0 mL of HBr 3.27
E. after addition of 32.0 mL of HBr
1.747
Question 15 of 15 >
Attempt 1
The pK, of hypochlorous acid is 7.530. A 57.0 mL solution of 0.127 M sodium hypochlorite (NaOCl) is titrated with 0.263 M
HCI.
Calculate the pH of the solution after the addition of 9.96 mL of 0.263 M HCl.
pH =
7.822
Calculate the pH of the solution after the addition of 28.8 mL of 0.263 M HCl.
o
pH =
2.473
Calculate the pH of the solution at the equivalence point with 0.263 M HCl.
pH =
4.299

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