ana. chem Flashcards
(21 cards)
In a titration experiment, a student finds that 23.48 ml of NaOH solution are needed to neutralize 0.5468 g of KHP (MW: 204.2). What is the conc (in molarity) of the NaOH solution?
A. 0.15 M
B. 0.13 M
C. 0.11 M
D. 0.09 M
C. 0.11 M
50.00 ml portion of an HCl solution required 29.71 ml of 0.01963 M Ba(OH)2 to reach an endpoint with bromocresol green indicator. Calculate the molarity of the HCl.
A. 0.01 M
B. 0.02 M
C. 0.03 M
D. 0.04 M
B. 0.02 M
Problem 10-12. Calculate the pH in the titration of 25 ml of 0.1 M HCl by NaOH after the addition to the acid solution of 10 ml, 25 ml, and 35 ml of 0.1 M NaOH.
- 10 ml of 0.1 M NaOH
A. 1.37 B. 1.73 C. 1.48 D. 1.84 - 25 ml of 0.1 M NaOH
A. 7 B. 14 C. 4 D. 1 - 35 ml of 0.1 M NaOH
A. 13.12 B. 10.12 C. 11.34 D. 12.22
- A. 1.37
- A. 7
- D. 12.22
Ksp of AgCl at room temperature is 1x10-10. Calculate the Ag+ ion concentration in ppm in a 0.01 M NaCl solution.
A. 0.001079
B. 0.0024
C. 0.0035
D. 0.0042
A. 0.001079
In an acidic solution, 25 ml of 0.021 M KMnO4 oxidize Fe2+ to Fe3+. Calculate the mass of Fe2+ (55.85g) oxidized
A. 14.66mg
B. 25.32mg
C. 2.55mg
D. 146.6mg
A. 14.66mg
The presence of the following cations od solutions maybe confirmed by
conducting flame tests, except:
A. Ba+2
B. Na+1
C. Ca+2
D. Ni+2
D. Ni+2
A small amount of KI is added to solution of NaCN. 35 mL of 0.1200 M AgNO3 is required to produce a precipitate of AgI. Find the milligrams of NaCN present.
A. 245.6 mg
B. 378.6 mg
C. 397.5 mg
D. 411.8 mg
D. 411.8 mg
0.7500 g sample of an alloy steel yielded on electrolysis 0.1532 g of a mixed deposit of Co and Ni. This is dissolved, and the precipitated nickel dimethylglyoxime (NiC8H14N4O4) weighs 0.3560 g. What is the percentage of the Ni in the alloy?
A. 9.64% Ni
B. 10.79%Ni
C. 12.43
D. 13.79% Ni
A. 9.64% Ni
In the titration of a water sample using double indicator, the volume of standard acid required for the methyl orange endpoint is equal to the volume required for the phenolphthalein endpoint. The impurity (ies) is/are:
A. NaOH only
B. Na2CO3 only
C. NaHCO3 only
D. Na2CO3 and NaOH
B. Na2CO3 only
The pH value at equivalence point when titrating a weak acid against a strong base is
A. at exactly 7
B. greater than 7
C. less than 7
D. neutral
B. greater than 7
EDTA is
A. not useful as a chelating agent
B. an effective antidote for heavy metal poisoning
C. known to form unstable complex ions with Fe3+, Hg2+, and Zn2+
D. a monodentate ligand
B. an effective antidote for heavy metal poisoning
Which response gives the products of hydrolysis of KF?
A. KOH and HF
B. OH- and HF
C. KOH, H+ and F-
D. no hydrolysis
D. no hydrolysis
A grain sample as received contains 10% moisture. If after drying, the dried sample contains 15% N, then the %N in the as received sample is
A. 13.5
B. 16.67
C. 15
D. 5
A. 13.5
Calculate the molarity of NaOH solution if 12.25 ml was used to titrate 0.2615mgrams of primary standard KHP
A. 0.2118
B. 0.1354
C. 0.1045
D. 0.1697
C. 0.1045
What weight of Mn ore should be taken so that the percentage of MnO2 in the ore can be found by multiplying by 5 the number of centigrams of Mn3O4 obtained?
A. 2.28 g
B. 2.28 cg
C. 228 g
D. 0.228 g
D. 0.228 g
A 10.0 ml solution containing Cl- was treated with excess AgNO3 to precipitate 00.4368 g of AgCl. What was the concentration of Cl- in the unknown? (AgCl = 143.321 g/mol)
A. 0.0384 M
B. 0.8048 M
C. 0.3048 M
D. 0.4038 M
C. 0.3048 M
When a sample of impure potassium chloride (0.4500 g) was dissolved in water and treated with an excess of silver nitrate, 0.8402 g of silver chloride was precipitated. Calculate the percentage KCl in the original sample.
A. 96.27%
B. 92.16%
C. 96.12%
D. 97.12%
D. 97.12%
The precipitant commonly used for the determination of calcium in gravimetric analysis is ___.
A. NH3
B. H2C2O4
C. H2PtCl6
D. HF
A. NH3
Which of the following is a bidentate ligand?
A. CN-
B. NH3
C. CO
D. H2NCH2CH2NH2
D. H2NCH2CH2NH2
Which gas is formed in the Kjeldahl analysis of nitrogen in the sample?
A. NH3
B. H2
C. N2
D. NH4Cl
A. NH3
When KMnO4 is reacted with Fe2+ in acid medium, Mn2+ and Fe3+ are formed. The equivalent weight of KMnO4 in this reaction is equal to
A. FM/2
B. FM/4
C. FM/5
D. FM/7
C. FM/5