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Intro to Chemical Engineering
Quantitative Chemical Analysis
307 SOLVED PROBLEMS
Question: AE.2
Using Normality How many grams of potassium oxalate should be dissolved in 500.0 mL to make a 0.100 N solution for titration of MnO4^− ? 5H2C2O4 + 2MnO4^− + 6H^+ ⇔ 2Mn^2+ + 10CO2 + 8H2O (E-5) ...
Verified Answer:
It is first necessary to write the oxalic acid hal...
Question: AE.3
Finding Normality A solution containing 25.0 mL of oxalic acid required 13.78 mL of 0.041 62 N KMnO4 for titration, according to Reaction E-5. Find the normality and molarity of the oxalic acid. ...
Verified Answer:
Setting up Equation E-6, we write
N_{1}V_{1...
Question: AE.1
Finding Normality Find the normality of a solution containing 6.34 g of ascorbic acid in 250.0 mL if the relevant half-reaction is ...
Verified Answer:
The formula mass of ascorbic acid
(C_{6}H_{...
Question: AD.2
A Reverse Disproportionation Now try the next reaction, which represents the reverse of a disproportionation. (In a disproportionation, an element in one oxidation state reacts to give the same element in higher and lower oxidation states.) I2 + IO3^− + Cl^− ⇔ ICl2^− ...
Verified Answer:
The oxidation numbers are assigned above. Note tha...
Question: AD.1
Balancing a Redox Equation Balance the following equation using H^+, but not OH^−: Fe^2+ + MnO4^− ⇔ Fe^3+ + Mn^2+ ...
Verified Answer:
Assign oxidation numbers. They are assigned for Fe...
Question: AC.1
Finding the x-Intercept For the line y = mx + b, the x-intercept occurs when y = 0, or x = −b/m. Let’s designate the x-intercept as the function F = −b/m. Find the x-intercept and its uncertainty for the least-squares line in Figure 4-11. ...
Verified Answer:
The following quantities are computed in Section 4...
Question: 8.4
Using the Henderson-Hasselbalch Equation. Sodium hypochlorite (NaOCl, the active ingredient of almost all bleaches) was dissolved in a solution buffered to pH 6.20. Find the ratio [OCl^−]/[HOCl] in this solution. ...
Verified Answer:
In Appendix G, we find that
pK_{a}
...
Question: 8.3
A Weak-Base Problem. Find the pH of 0.10 M ammonia. ...
Verified Answer:
When ammonia is dissolved in water, its reaction i...
Question: 8.2
A Weak-Acid Problem. Find the pH of 0.050 M trimethylammonium chloride. ...
Verified Answer:
We assume that ammonium halide salts are completel...
Question: 8.E.J
(a) Find the pH of a solution prepared by dissolving 1.00 g of glycine amide hydrochloride (Table 8-2) plus 1.00 g of glycine amide in 0.100 L. (b) How many grams of glycine amide should be added to 1.00 g of glycine amide hydrochloride to give 100 mL of solution with pH 8.00? (c) What would be the ...
Verified Answer:
(a) pH =
pK_{a} + \log \frac{[B]}{[BH^{+}]...
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