Questions and Answers of Quantitative Chemical Analysis

Zinc is an essential micronutrient in pet food, but is toxic if present in excess. Do the znZn concentrations (mg/g)(mg/g) for the five cat foods and two dog foods determined by two methods differ
Students measured the concentration of HС1HС1 in a solution by titrating with different indicators to find the end point.Is the difference between indicators A and B significant at the 95%95%
Big Data. Modern analyses can generate thousands of data points. This problem introduces techniques for handling larger data sets. A spreadsheet with the data can be found on SaplingPlus or at
Calculate the mean and standard deviations for the following replicate readings of a buret (mL): 32.56,32.56, 32.53, 32.53, 32.54,32.54, 32.77,32.77, and 32.54.32.54. Consider what to do with any
State five methods to determine if calibration data are linear or curved. Rank the methods on their ability to determine if a linear calibration is fit for purpose.
Standard methods. Search the Internet for the requested information about the following standard methods.a. What analyte and in what matrix is U.S. Environmental Protection Agency method 200.7 200.7
Standard addition. The U.S. Environmental Protection Agency sets guidelines for the level of contaminants in drinking water below which no adverse health effects are likely to occur. The limit for
For the reaction HCO3-⇌H++CO32-,HCO-3 ⇌ H- + CO32-, ΔG°=+59.0 kJ/molΔG° = +59.0 kJ /mol at 298.15 K. 298.15 K. Find the value of KK for the reaction.
Find the concentration of Cu+Cu+ in equilibrium with CuBr(s)CuBr(s) and 0.10 M Br-0.10 M Br -.
Suppose that you precipitate Hg22+Hg22+from a solution containing 0.01 M Hg2(NO3)20.01 M Hg2(NO3)2and 0.01 M Pb(NO3)20.01M Pb(NO3)2 by adding I-l- . If you want to know whether a small amount of
Calculate [H+] [H+] and pHpH for the following solutions:a. 0.010 M HNO3 0.010 M HNO3b. 0.035 M KOH 0.035 M KOHc. 0.030 m HCl 0.030 M HCld. 3.0 M HCl 3.0 M HCle. 0.010
The equilibrium constant for the reaction H2O⇌ H++OH-H2 O ⇌ H+ + OH- is 1.0x10-14 1.0x10-14 at 25°C 25°C. What is the value of KK for the reaction 4H2O⇌4H++4OH-? 4H2 O ⇌ 4H+ + 4OH- ?
Write the KbKb reaction of CN-CN- Given that the KaKa , value for HCNHCN is 6.2x10-10, 6.2x10-10 calculate KbKb for CN-CN-.
Examine the procedure in Table 7-1 for the Fajans titration of Zn2+.Zn2+. Do you expect the charge on the precipitate to be positive or negative after the equivalence point?Table 7-1 TABLE 7-1
What is wrong with this procedure? According to Table 7-1, carbonate can be measured by a Volhard titration. Removal of the precipitate is required. To analyze an unknown solution of Na2CO3,Na2CO3, I

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