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Write a balanced equation for the reaction of Ag(H2O)2+ in aqueous Na2S2O3.
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- Explain why K2CrO4 is used as an indicator in Argentometric titration?Write the equilibrium constant expressions for the following chemical reactions (using the net ionic reactions): a) the formation of FeSCN2+ b) the reaction of KHP with NaOH (see Experiment 1) c) the titration of Na2CO3 with HCl (see Experiment 1)1. What is the primary use of standard K2Cr2O7 solutions?
- A 14.92 g sample of bacon is pureed in a blender with 100.0 mL of water. The suspension is filtered and the clear solution containing dissolved sodium nitrite is adjusted to pH 2. The solution is treated with 25.0 mL of 0.0150 M KMnO4 to oxidize the nitrite to nitrate and after standing for 10 minutes, the excess KMnO4 is back titrated with 15.0 mL of 0.0818 M FeSO4. What is the concentration of nitrite in the bacon as parts per million?What [F–] is required to reduce [Ca2+] to 1.0 × 10–4 M by precipitation of CaF2?Why is it possible to use K2S instead of thioacetamide in precipitating the Group II and Group III cations?
- 50.00 mL of 0.25 M HNO2 (nitrous acid, Ka = 4.74 x 10^-4) is titrated with 0.25 M KOH solution. What would be the pH of the solution after 25.00 mL of the KOH solution is added?A water sample has exact alkalinity of 220 mg/L CaCO3. The sample contains150.0 mg/L HCO3 at a pH of 7.1 (Temperature = 25 oC).(a) Calculate the carbonate alkalinity in mg/L as CO3.(b) Calculate the approximate alkalinity.(c) Comment on the difference between the exact and the approximate alkalinityWhich of the following reacts with Na2CrO4 to from a yellow precipitate? Ag+ Pb2+ Hg22+ all of the above
- Why is phthalic acid soluble in water and what type of IMFs are involved in the solubility of it in water?What is the solubility of PbCO3(s) in 0.5M Na2CO3?A sample of meat scrap weighing 2.000 g is digested with concentrated sulfuric acid and a catalyst. The resulting solution is made alkaline with NaOH and the liberated ammonia distilled into 50.00 mL of 0.6700 N HCl. The excess acid then requires 30.10 mL of 0.6520 N NaOH for neutralization. What is the percentage of the protein in the meat? The Kjeldahl factor is 6.25.