A sample of corn oil weighing 1.600 g saponified with 12.5 mL of 0.5 N KOH required 9.0 mL of 0.5 N HCl to titrate the excess KOH. In the blank determination, 20 mL of 0.5 N HCl was required to titrate the alkali. Calculate the saponification value of the sample. Interpret the obtained saponification number according to: a. Length of the carbon chain (short/long) b. Number of carboxyl groups (few/many) c. Molecular weight (high/low)

A sample of corn oil weighing 1.600 g saponified with 12.5 mL of 0.5 N KOH required 9.0 mL of 0.5 N HCl to titrate the excess KOH. In the blank determination, 20 mL of 0.5 N HCl was required to titrate the alkali. Calculate the saponification value of the sample. Interpret the obtained saponification number according to: a. Length of the carbon chain (short/long) b. Number of carboxyl groups (few/many) c. Molecular weight (high/low)

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter16: Applications Of Neutralization Titrations

Section: Chapter Questions

Problem 16.32QAP

See similar textbooks

Similar questions

Calculate the alkaline strength of pearl ash (impure potassium carbonate) in terms of percent K2O from the following data: Sample = 0.3500 g; HCl used = 48.03 mL; NaOH used for back titration = 2.02 mL; 1.000 mL HCl = 0.005300 g Na2CO3; 1.000 mL NaOH = 0.02192 g KHC2O4.H2O. (Note: Use the least significant digits in your answer.)
A 865.6 gram sample of bacon was pureed in a blender with 100 mL water. The suspension was filtered and the clear solution containing dissolved sodium nitrite was adjusted to pH 2. This solution was treated with 15.00 mL of KMnO 4 solution (1 mL » 212.4 mg H 2C2O4 × 2H 2O) and was back titrated with 12.73 mL of FeSO4 solution (1 mL » 87.5 mg K 2Cr2O7). Calculate the amount of nitrite (NO2–1) in ppm. H2C2O4 × 2H 2O (126) K2Cr2O7 (294.2) a. 370 b. 1480 c. 740 d. 1110
A Fajans titration of a 0.7908-g sample required 45.32 mL of 0.1046 M AgNO3 . Express the results of this analysis in terms of the percentage of BaCl2 * H2O. (Use a MW value in 4 decimal places)
On the redox titration experiment, Standardization of Na2S2O3 with KIO3 standard solution, what can be replaced KIO3 to make safer solvent and auxiliaries( reduced toxic waste)? explain why?
100 mL water sample was subjected to DO analysis using the Winkler method. The initial reading of the titrant (0.025 M Na2SO3) in the buret was 2.51 mL. The endpoint was obtained and the final reading was 7.07 mL. A blank was also titrated and 0.75 mL of the titrant was consumed. Compute for the amount of DO (mg/L) in the sample.
A 1.876 g of the sample containing H2C2O4 requires 38.84 mL of 0.1032 M of NaOH for titration: H2C2O4 + 2 NaOH → Na2C2O4 + 2 H2O A 1.38 mL of 0.0992 M HCl is used in the back – titration. (a) Calculate the percentage of H2C2O4 in the sample. (b) Calculate the percentage expressed as the dihydrate, H2C2O4•2H2O.
A mixture of 500.0 mg acid A and 250.0 mg acid B is titrated with 0.1150 N NaOH. The endpoint is overstepped on the addition of 45.30 mL of the base. The solution is backtitrated using 1.40 mL of 0.1234 N HCl solution. If the equivalent weight of A is thrice the equivalent mass of B, calculate the equivalent weights of A and B.
Part b and C What volume of 0.110 M HCI is required for the complete neutralization of 1.10 g of Na2 CO3 (sodium carbonate)? Express your answer to three significant figures and include the appropriate units. A sample of NaOH (sodium hydroxide) contains a small amount of Na2 CO3 (sodium carbonate). For titration to the phenolphthalein endpoint, 0.110 g of this sample requires 23.98 mL of 0.100 M HCI. Ar additional 0.700 mL of 0.100 M HCI is required to reach the methyl orange endpoint. What is the percentage of NaCO; by mass in the sample? Express your answer to three significant figures and include the appropriate units.
What factor affects the ‘strength’ of a buffer? Why was benzoic acid used as a solvent when making up the glucose stock standard solution?
A 0.5131-g sample containing KBr is dissolved in 50 mL of distilled water. Titrating with 0.04614 M AgNO3 requires 25.13 mL to reach the Mohr end point. A blank titration requires 0.65 mL to reach the same end point. Report the %w/w KBr in the sample.
An unknown sample containing mixed alkali (naoh, nahco3, or na2co3) was analyzed using the double flask method. a 250 mg sample was dissolved in 250 ml co2 free water. a 20.0 ml aliquot of this sample required 11.3 ml of 0.009125 m hcl solution to reach the phenolphthalein end point. another 29.0 ml aliquot of the sample was titrated to the bromocresol green endpoint using 31.1 ml of the standard acid. how many millimoles of the components are there in the original solid sample
Calculate the alkaline strength of pearl ash (impure potassium carbonate) in terms of percent K2O from the following data: Sample = 0.3500 g; HCl used = 48.03 mL; NaOH used for back titration = 2.02 mL; 1.000 mL HCl = 0.005300 g Na2CO3; 1.000 mL NaOH = 0.02192 g KHC2O4.H2O.