on 13 of 14 > A student was given a solid containing a mixture of nitrate salts. The sample completely dissolved in water, and upon addition of dilute HC, no precipitate formed. The pH was lowered to about 1 and H,S was bubbled through the solution. No precipitate formed. The pH was adjusted to 8 and H,S was again bubbled in. This time, a precipitate formed. Which compounds might have been present in the unknown? Cr(NO,), Ni(NO,)2 Ca(NO3)2 O Cu(NO,), KNO, O Bi(NO,)3 V Zn(NO,), O AGNO, 6:27 1O 80°F Mostly sunny 7/30

on 13 of 14 > A student was given a solid containing a mixture of nitrate salts. The sample completely dissolved in water, and upon addition of dilute HC, no precipitate formed. The pH was lowered to about 1 and H,S was bubbled through the solution. No precipitate formed. The pH was adjusted to 8 and H,S was again bubbled in. This time, a precipitate formed. Which compounds might have been present in the unknown? Cr(NO,), Ni(NO,)2 Ca(NO3)2 O Cu(NO,), KNO, O Bi(NO,)3 V Zn(NO,), O AGNO, 6:27 1O 80°F Mostly sunny 7/30

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter8: Polyfunctional Acids And Bases

Section: Chapter Questions

Problem 3P

See similar textbooks

Similar questions

Explain brieflyWhat would happen to the total hardness if the solution was buffered to pH 13.00? What is done to the soda ash solution when the pre-equivalence point of the methyl orange endpoint is reached? What compound is trying to be removed?
In this activity, you will develop an experimental procedure to solve a problem. Consider the followingscenario:You are the manager of a chemical stockroom, and find a bottle containing approximately one liter of aclear and colorless solution of unknown identity and concentration. Your only clue to its identity is thatit was found between bottles of silver fluoride and sodium fluoride, so it is likely an aqueous solution ofone of those two compounds. You will need to develop a procedure to determine the following:a) The identity of the unknown solutionb) The concentration of the unknown solutionWrite out a precise procedure, which includes all glassware, reagents, and steps. You will also need towrite the calculations that you would need to determine the concentration of the solution. Assume thatyou have access to any reagent you might need
50 cm3 of 0.05 M weak acid solution is titrated with 0.1 M NaOH solution. The measured pH valuesare 7.345 and 7.497 at the consumptions of 6.0 and 6.1 cm3, respectively. What value of the buffer capacity can be calculated in the solution at pH = 7.421?
Many chemical reactions are carried out in the presence of buffers. Use the Henderson-Hasselbalch equation to provide a recommendation for a suitable acete/acetic acid buffer under the following reaction conditions. a) If a checial reaction produces hydroxide ion, OH-, what would be the range for the target pH of a buffer soution that would favor pH stabilizatoin under these conditions? Explain.
Give only typing answer with explanation and conclusion to all parts A. When 18.0 mL of a 6.77×10-4 M ammonium sulfate solution is combined with 18.0 mL of a 3.79×10-4 M silver nitrate solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to____ B.When 25.0 mL of a 2.00×10-4 M calcium bromide solution is combined with 18.0 mL of a 4.07×10-4 M ammonium phosphate solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to ____
Will Mn(OH)2 precipitate from a 0.01 M solution of MnCl2 at pH = 9? Ksp(Mn(OH)2) = 1,0 x 10-13. Discuss from solubility diagrams and prove by calculation.calculation. Co is a metal that is present in every lithium battery to stabilize its charge and toincrease stability. Every cell phone, tablet and electric car relies on the availability ofcobalt, 97% of which is extracted from mines in places like the Congo, where essentially slave labor is used.Cobalt ions form complexes with e.g. CN- . You see solubility diagrams and fraction diagrams for CoCO3 with and without the addition of 10 mM CN- .. Explain whythe solubility of cobalt carbonate increases at high pH when cyanide ions are present.Write reaction formulas for the formation of the dominant cobalt cyanide complexes.
In the determination of chloride by the Mob method, what will be the equiliblium concentration of silver ions in mgil, on the basis of the solubility product principle, when the chloride concentation has been reduced to 0.2 ma? (b) If the concentration of chromate indicator used is 5X M, how much excess silver ion in mgil must be present before the formation of a red precipitate will begi(a) In the defermination of chloride by the Mohr method, what will be the equilibrium concentration of silver ions in meL., an the basis of the solubility. pcoduct principle, when the chloride concencration has beea reduced to 0.2m 1.2m? (b) If -3 the concentration of chromate indicator ased is 5 x 10M, bow much excess silver ion in mel, must be present before the formatice of a red precipitate will begin?
Standard solution : 0.201 grams of acetylsalicylic acid was combined with 10 mL of 0.5 M NaOH, then transfered to a 100 mL flask and filled the rest of the way with water Then 0.500 mLs of the standard solution was transfered to a 10.00 mL flask and diluted to the 10 mL mark with 0.02 M of buffered iron chloride. Number of moles of NaOH = 0.005 moles Since the reaction between acetylsalicylic acid and NaOH is a 1:1 reaction, the number of moles of acetylsalicylic acid used in the reaction is also 0.005 moles. the concentration from analysis question 5: acetylsalicylic acid in the 100.00 mL volumetric flask is 0.050 M. From your plot, what is the value of εb? From the Beer- Lambert law For the aspirin sample, calculate the concentration of acetylsalicylic acid present using the value of εb that you found The concentration from analysis question 5 represents the concentration in the 10.00 mL sample that was prepared in the volumetric flask using an aliquot of the solution in the…
The acid-dissociation constant at 25.0°C for hypochlorous acid (HClO) is 3.0 × 10-8. At equilibrium, the molarity of H3O+ in a 0.044 M solution of HClO is
Use the systematic treatment to get the concentrations of all the species in a solution of: a.) saturated PbSO4 buffered at pH 7
b. A student has a sea water sample which contains Ca2+ ions . Describe briefly how he willdetermine the concentration of Ca2+ ion in the sample using a simple titration. Explain the colourchanges at the endpoint. Which medium is suitable for performing the titration, acidic or basic medium and why?
) If you needed to perform a reaction in a controlled pH environment that was fairly basic, you might choose to use the ammonium and ammonia buffer system. How many grams of solid ammonium chloride would you have to add to 1.350 liters of 0.130M NH3 to obtain a buffered solution of pH = 8.45? (Kb of NH3 = 1.8 × 10-5)