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classifiy whether it is greater than, less than, or equal.
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- Calculate the formal concentration in m olarity of a sodium acetate soluti on prepared by diluting 22.5 mL. of a solution containing 25.0 ppm sodium acetate (NAC2H302) 82.03 g/mol to atotal of 0.500 liters of solution. 1. O2.75 x 10-5 Molar 2. O6.10 x 10-4Molar 3. O1.37 x 105 Molar 4. O5.48 x 10-6 MolarAns. 17.15 mg. 54) A 1.000-g sample of a mixture which contains only NaCl and KCl gare a precipitate of AgCl which weighed 2.000 g. What are the percentages of Na and K in the mixture? ins 10 g Ans. 44.77% K; 5.75% Na. 1:J 55. I- can be sernarated from othorFive drops of dichlorofluorescein have been added to a solution containing 0.800 g sample which required 25.30 mL of 0.100 M AgNO3. (c) Calculate the weight percent NaCl in the original sample.
- 2 litre carbogen (at S.T.P.) is passed through a solution of lime water to get 0.5 g white precipitate. The percentage of carbon dioxide gas in carbogen by volume is(a) 8 (b) 11.2(c) 5.6 (d) 22.412.29 A 50 g sample of impure KCIO; (solubility contaminated with 10 percent of KCI (solubility = 25.5 g per 100 g H2O at 20°C). Calculate the minimum quantity of 20°C water needed to dissolve all the KCI from the sample. How much KCIO3 will be left after this treatment? (Assume that the solubility are unaffected by the percent of the other compound). = 7.1 g per 100 g H20 at 20°C) is %3DWhich of the following is soluble in water at 25∞C a) FeCO3 c) Fe(OH)2 b) Fe3(PO4)2 d) Fe(NO3)2
- A solution was prepared by dissolving 1280 mg of K3FE(CN), in sufficient water to give 770 ml. Calculate a) the formal concentration of K3FE(CN), b) the molar concentration of K* c) the weight/volume percentage of K3FE(CN), d) ppb Fe(CN);-.K2CO3(aq) + 2HC2H3O2(aq) yields 2KC2H3O2(aq) + H2O(l) + CO2(g) How many moles of H2O can be obtained from 25.0 ml of 0.150 M HC2H3O2?45. Fig. 9 presents a plot of change in KNO3 solubility in water with increasing temperature. This plot shows the concentration of the saturated solution expressed in g of KNO3 per 100 g of H2O. Calculate the molarity of this solution at 30ºC knowing that the density at this temperature equals 1.25 g/cm³. 100 90 Fig. 9, Change in KNO3 solubility in water with increasing temperature A. 12.4 mol/dm³ B. 5.0 mol/dm³ C. 4.0 mol/dm³ D. 3.6 mol//dm³ E. 1.8 mol/dm³ solubility g of KNO3 in 100g of H₂O 80 70 60 50 40 30 20 10 0 0 10 20 30 30 40 50 60 70 temperature/°C
- Lead chiorde. PEC occun naturaty as mineral cotunnile. Given that K value of PbCis1210 What a the solubily of PbCly in a 0.5 Msolufion of potosium chioride. KCRIf 50.0 mL of Thiosulfate solution are required to titrate the I2 liberated from an excess ofKI by 0.3000 grams of potassium Iodate, calculate (a) normality of the thiosulfate solution(b) value of each milliliter of Thiosulfate solution in terms of grams of I2.A solution was prepared by dissolving 367 mg of K3Fe(CN)6 (329.2 g/mol) in sufficient water to give 750.0 mL. Calculate (a) the molar analytical concentration and Normality of K3Fe(CN)6. (b) the molar concentration of K+. (c) the molar concentration of Fe(CN)63-. (d) the weight/volume percentage of K3Fe(CN)6.