LO-2 3. The measurement data for the dipole moment (u) of two acid halide molecules expressed in Debye (D) units are HBr: 0.82 D and HI: 0.45 D. If the bond lengths of HBr and HI are 141 pm and 161 pm, respectively, calculate the partial charge (0) of each atom in the molecules. It is known that 1D=3.34x10- 30 Cm. How many significant figures are in your answer? Explain.
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- The pH for 0.050 M CH3NH2 (Kb for CH3NH2 = 4.0 X 10^-4 )?The pH of a 4.0 × 10-3 mol dm-3 solution of weak base is 10.4. Calculate the Kb of the weak base.1. What is the MW of the analyte?2. What is the meq of the analyte?3. What will be the weight (in grams) of the analyte if the standardization is to be quartered?4. What will be Normality of the solution if 7.5ml of the titrant was consumed in the standardization?5. What is the average Normality if two or more trials were conducted with the values of 0.102N and 0.105N?
- Can precipitation give a confirmatory result on Group V cations: K, Na, and NH4?Conductivity of 2.5 X 10-4M methanoic acid is 5.25 X 10-5 S cm-1 Calculate its molar conductivity and degree of dissociation.Given: A°(H+) = 349.5 S cm2 mol-1 and A°(HCOO– ) = 50.5 S cm2Conductivity of 2.5 × 10-4 M methanoic acid is 5.25 × 10-5 S cm-1. Calculate its molar conductivity and degree of dissociation.Given : λ0(H+) = 349.5 Scm2 mol-1and λ0(HCOO–) = 50.5 Scm2 mol-1.
- The conductance of 0.10 M NaOH is about 20,000 mS. What can you conclude about the mobility of the hydroxide ion?Consider that benzoic acid is a weak acid which has a Ka of 6.3 x 10-5 . C6H5COOH → C6H5COO- + H+ Calculate the [H+ ] ion concentration of a 0.04 M benzoic acid solution. Use your findings from above, determine the pH of the solution.A mixture containing only KCl and NaBr is analyzed by the Mohr Method. A 0.3172-g sample is dissolved in 50 mL water and titrated to the Ag2CrO4 endpoint, requiring 36.85 mL of 0.1120 M AgNO3. A blank titration requires 0.71 mL of titrant to reach the same endpoint. Report the % (w/w) KCl and NaBr in the sample. [Answer should be 82.41 % (w /w)]
- Prepare 100ppm of Cd (NO3).4 H2O in a 500mlTwenty sodium salicylate tablets labeled 325 mg were dispersed in sufficient water to make 200.0 mL. A 15.0–mL aliquot of the filtrate was titrated to a bromophenol blue endpoint in the usual way by 32.11 mL of 0.1000 N hydrochloric acid. Calculate the amount of sodium salicylate in each tablet, and from that, the percentage of the labeled amount. (NaC7H5O3 MW = 160.11 g/mol) Amount of sodium salicylate in each tablet = % labelled amount =a. Give the molar concentration of hydrochloric acid with a specific gravity of 1.18 andhas 37% (w/w) purity. MW=36.5 b. How would you prepare 1.2 L of 0.40 M hydrochloric acid starting from a 2.0 M solution?