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A 0.204 g sample of a CO3^2- antacid is dissolved with 25.0 mL of a 0.0981 M HCl. The hydrochloric acid that is not neutralized by the antacid is titrated to a bromophenol blue endpoint with 5.83mL of 0.104 M NaOH. a) Calculate the number of moles of base in the antacid. b) Determine the moles of base per gram of antacid in the sample. Express your answer with the correct number of significant figures.
Manganese dioxide reacts with hydrochloric acid as shown in the chemical equation MnO2(s) + 4HCl(aq)-->MnCl2O(l) + Cl2(g) What is the percent yield of the reaction if 5.75 g of H20 is obtained when 28g of MnO2 and 28g of HCl are mixed and allowed ..
the heat of fusion of ice at this temperature is 5610 J/mol. Find entropy change of the universe when 3mol of water freezes at -10degreesC
A saturated solution of NaNO3 in 100 grams of water at 40 degrees celcius is heated to 50 degrees celcius. What is the rate of increase in solubility in grams per degree?
The most accurate values of absorbance are obtained in the range of A = 0.3-2. Which of the following reasons account for lowered accuracy at higher or lower absorbancy values? (Check all that apply).
What volumes of 0.50M HNO2 (Ka = 4.00*10^-4) and 0.50M KNO2 is needed to make a 1L buffered solution with a pH of 3.00
What is the minimum flow rate of water (? = 0.990 g/mL) required to scrub out 90.0% of the incoming NH3? What is the mole fraction of NH3 in the scrubbed waste gas stream?
2 Al(OH)3 + 3 H2SO4 → Al2(SO4)3 + 6 H2O. How many grams of Al2(SO4)3 are generated when 152 g of H2SO4 reacts.
C2H6+O2 ---> CO2+H2O Calculate the mass of H2O that should form if 1.5 g of C2H6 is combusted in the presence of 2.5 g of O2.
Calculate the solubility of Ce(IO3)3 (pKsp=10.86) in: a) distilled H20 b) 0.300 M Ce(NO3)3 solutiom c) 0.200 M KIO3 solution
What is the net redox reaction that occurs when Ag comes into contact with acidic K2Cr2O7? Which metal is the most reactive?
An emerald gemstone is an impure form of the mineral beryl, Be3Al2Si16O18. What is the percentage of silicon in the mineral?
If the average collection period is 55 days, what is the receivables turnover?
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