9. For a solution containing potentially silver and/or lead cation(s), wnat can pe deauceuregarding the presence or absence (if applicable) of these ions from each of the followingsubsequent steps in the experiment?(a) If you add a few drops of 6 M HCI to the solution, a white precipitate forms.(b) After adding hot water to the solid in (a) and separating the resulting supernate and solid,you add a few drops of 0.1 M K2CrO4 to the colorless solution, resulting in a yellow solution.Office DEPOT# 2/HB

Given : Solution has lead and/or silver ions. With 6M HCl white precipitate observed. Yellow…

Answered: 9. For a solution containing…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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4. A 1.0005 g sample contains selenite was determined using Fajan's method by performing a titration against standard 0.023 M silver nitrate solution, consuming 9.4 ml from burette to reach the end point. Write the balanced chemical equation between (FM: 169.87) AGNO; and (FM: 172.948) Na,SeO; to calculate % selenite (FM 126.968) SeO;² in the sample. * 0.343 % O 0.686 % 1.029 % 1.372 %
A sample of steel weighing 2.00 g is analyzed for Cr (AW 52.0). The Cr is oxidized into chromate with alkaline permanganate and the excess permanganate is destroyed. A certain volume of 0.120 M FeSO4 is added to the acid solution and the excess is titrated with 0.0220 M KMnO4, requiring 31.0 mL. If the sample contained 0.50 % Cr, what volume (in mL) of FeSO4 was added?
Scott test is one of the methods used for screening for Cocaine in Forensic Chemistry. The multi step method consists of a) reacting the sample drug with cobaltous thiocyanate (Co(SCN)2) b) dissolving of the formed precipitate by adding HCl and c) extraction of coordination compound with Chloroform d) measurement of absorbance of extracted coordination compound at 627 nm What is the type of chemical equilibria involved in first step of the method? a.Solubility Product equilibria b.Bronsted Lowry acid – Bronsted Lowry base equilibria c.Complex ion formation d.Coordination compound formation
To make up a solution of phosphate buffered saline (PBS), you need 10 mM Na2HPO4 (anhydrous) (FW: 141.96 g/mol), 3 M NaCl (FW: 58.44 g/mol), and 5mM KH2PO4 (FW: 136.09 g/mol). How many grams of each will you need to make up 850 mL of PBS?
2.1 Estimate the solubility of calcium carbonate at 25°C in the presence of 0.02M CaCl2(aq). 2.2 Will BaSO4 precipitate from a solution containing 2.5 x10 M Ba*2, barium ion, if enough soluble salt, Na2SO4, is added to make the solution 2.5 x104 M in SO42?
Thimerosal Tincture USP contains 0.1% w/v thimerosal and 50% v/v ethyl alcohol. If the cap is left off of a 15-mL bottle of the tincture, and the ethyl alcohol evaporates leaving a final volume of 9.5 mL, what is the concentration of thimerosal in the evaporated solution expressed as a ratio strength?
67. Purified water contains not more than 10 ppm of total solids. Express this concen- tration as a percentage. 67. 0.001% w/v
Consider a HCI solution with a pH of 4.70. a) Calculate the concentration of HCl. b) Identify the two underlying assumptions in part a). c) The original solution is diluted by 1,000 fold. Calculate the pH of the resulting solution. Make sure to indicate if the forementioned assumptions are still valid.
Given the figure below explain the effect of surfactants in terms of dirt removal on the solid surface.
Lisa and Jisoo wanted to prepare 150 mL of 0.650 M malonate buffer pH 5.00 by mixing NaC4H304 and Na2C3H204. Relevant Reaction: Ка, 3 1.4x10з Kaz = 2.0x10 6 C;H,O4 2 C,H;O4 1. What mass of solid NaC3H3O4 (MM = 138.054 g/mol) and solid Na2C3H2O4 (MM = 148.026 g/mol) will be needed to prepare the buffer? a. mass of solid NaC3H3O4 needed: b. mass of solid NazC3H2O4 needed: g
Consider the following acids and their ionization constant, determine which conjugate base is HCOOH Ka = 1.7 x 10-4 (b) HCN Ka = 4.9 x 10-10
A base is added to a 0.050 M solution of MnCl2, raising the pH gradually. Calculate the pH of the solution when 88 of the manganese has precipitated? Table 5-7 Solubility-Product Constants, K, at 25°C Fluorides Chromates (cont.) Ag, Cro, PbCro, Hydroxides (cont) Ni(OH), Zn(OH), Cu(OH), Hg(OH), Sn(OH), Cr(OH), A(OH), BaF, MgF, PbF, SrF, CaF, 2.4 x 10-5 X 10-8 x 10-8 1.9 x 10-12 1.6 x 10-16 4.5 X 10-17 1.6 x 10-19 3 2 x 10-16 4 Carbonates 7.9 x 10-10 3.9 x 10-11 X 10-26 NiCO, CaCO, BaCo, SrCO, CuCO, ZnCO, MnCO, 1.4 x 10-7 3 10-27 4.7 x 10- 6.7 x 5 x 6 x 10-38 2.5 x 10-43 Chlorides 10-31 1.6 x 10- 1.7 x 10-10 1.1 x 10-18 1.6 x 10-9 7 x 10-10 2.5 x 10-10 10-33 PBCI, AgCi Hg,Cl, Fe(OH), Co(OH), Sulfides 2 x 10-10 8.8 x 10-11 2.1 x 10-11 Bromides X 10-16 X 10-19 3 x 10-21 X 10-22 2.5 x 10-22 X 10-26 1.0 x 10-28 MnS 7. PbBr, AgBr Hg, Br, 4.6 x 10-6 5.0 x 10-13 Feco Ag,CO, CdCo, PBCO, MgCO, Hg,CO, Fes 4 8.2 x 10-12 5.2 x 10-12 1.5 x 10-15 1 x 10-15 NiS 1.3 x 10-22 Cos ZnS lodides Pbl, Agl…

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