P which more than one response has been bl questions you answer correctly. It is
ID: 695139 • Letter: P
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P which more than one response has been bl questions you answer correctly. It is to your advantage to answer 6. Nitrite is colorless in aqueous solution, l sblely on the number of 1. Which is true about a primary standard (A) It is hygroscopic. It has a low molar mass. It has a purity of 99.9% or better. It decomposes under ambient conditions. sulfanilamide, hydrochloric acid, and 1- a strongly colored dye. Which is the m blank to analyze before measuring any s (B) (C) (A) deionized water (B) solution with a standard concentrati (C) solution with sulfanilamide, hydroc (D) 2. All volumetric flasks (A) are dried in the oven 1-naphthol are calibrated to 0.001 mL. (D) solution with a standard concentratio (B) (C) are suitable for solution storage sulfanilamide, hydrochloric acid, an (D) are calibrated at a specific temperature. 7. A soil sample arrives at the lab and is wei analysis. What is the correct order of the before the sample can be acid digested and 3. A 10-mL aliquot t of a 2.55 M CuClh solution is diluted to 100-mL. A 15-mL aliquot of this solution is diluted to I concentration of copper in the (A) Dry in oven, homogenize, separate in 100-mL. What is the final resulting solution? (A) 25.5 mM (C) 255 mAM A student intended to prepare a 0 solution in a clean 100-mL volumetric flask. When is the samples, weigh each sample (B) Dry in oven, separate into replicate sa (B) 38.3 mM (D) 383 mVM homogenize, weigh each sample weigh each suem int (D) Separate into replicate samples, dry in (C) Homogenize, dry in oven, separate int 0475 M sodium oxalate samples, weigh each sample concentration higher than intended? A) Undissolved sodium oxalate is left behind in the homogenize, weigh each sample 8. Chloride ions present in a CaCl(aq) (110.98 '. If exces volumetric flask solution are precipitated using Ag added to 3.75 L of a solution and 0.577 g of (143.35 gmol ) are recovered, what is the m concentration of Ca2 in the solution? )The flask is filled until the top of the meniscus touches the etched line. The student accidentally makes the solution in a 250-mL volumetric flask. (A) 1.07x10s M (C) 2.01x10-3 M (B) 5.37 10+ (D) 2.15x103 9. Which buffer solution will exhibit the greates fter mixing, the student spills some solution while ansferring it to a storage bottle. in pH when the p is of a municipal water sample indicat ation of 30.2 ppm. What is the molarity of in the sample? Assume the density of the water mL to change in pH when the p-6.80? (a) 0 10 M dihydrogen phosphate (pK.-7 (B) 0.20 M dihydrogen citrate (pK, 4.77) a -1 ion (B) 7.54x102M (D) 7.53×10-7M hydrogen citrate ion (C) 0.30 M hydrogen citrate (pka -6.40) and (D) 0.40 M ammonium ion (pK,-9.25) and 10-4 M aminatione IExplanation / Answer
Ans 1 : C) It has a purity of 99.9% or better.
Primary standards are often used in the titration experiments to determine the concentration of of unknown solution. These are the solutions with accurate concentrations and high purity.
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