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- A 0.0712-g sample of a purified organic acid was dissolved in an alcohol-water mixture and titrated with coulometrically generated hydroxide ions. With a current of 0.0392 A, 241 s was required to reach aphenolphthalein end point. Calculate the equivalent mass of the acid.If you want to dissolve 0.225 grams of AgBr, what volume of 0.0138M Na2S2O3 in mililiters, should be usedFor a redox analysis of iron, how do you calculate the % (weight/weight) with a mass of the K2Cr2O7 that was diulted to 250.00ml is 1.488 grams, mass of unknown is 0.2839g, and the vol. titrant given was 24.38 ml?
- A 215 mL sample of a 0.500 M NaCl solution with an initial pHof 7.00 is subjected to electrolysis. After 15.0 minutes, a 10.0 mLportion (or aliquot) of the solution is removed from the cell andtitrated with 0.100 M HCl solution. The endpoint in the titrationis reached upon addition of 22.8 mL of HCl. Assuming constantcurrent, how much current (in A) was running through the cell?A mixture of NaBr, Nal and NaNO3 weighs 0.6500 g. With AgNO3, a precipitate of the two halides is obtained and is found to weigh 0.9390 g. When heated in a current of C2, the precipitate is converted entirely to AgCi weighing 0.6566 g. What is the %NaNO3 in the original sample?0.2219 g of pure iron wire was dissolved in acid nd iron reduced to+2 state. Then the solution required 34 65ml of cerium(4) in a titration . Calculate molar concentration of ce4+???
- calculate the mass of Sn when 50 mL of a sample containing Sn2+ is titrated with 42.00 mL of 0.0150M MnO4- to reach endpoint1. A pH electrode obeys the equation E= constant - 0.0592 pH. If the electrode potiential (E) is -0.105 V at 0.002500 M [H+], what is the electrode constant? 2. Using the electrode constant calculated abobe, determine the pH of a solution that gives the electrode potiential of -0.450V. Sketch the calibration plot for the pH electrode. Label the axes, electrode constant and the value of the slope on the calibration plot. Answer question 1The pH is essentially a voltmeter and the electrical potential across the glass membrane varies with [H+] of the test solution. Thus the Nernst equation, Eglass = Eoglass + 0.0591 log[H+], is applicable to the pH meter. What does Eoglass represent?
- a. Balance the following redox in acidic media C2O42- (aq) + MnO4- (aq) → CO2(aq) + Mn2+ (aq) b. If you titrated this reaction to determine the moles of C2O42-, the colormetric endpoint is pink due to the Mn2+. How many moles of the oxalate (C2O42-) existed in solution if 12 mL of 0.791M permanganate was needed to hit the endpoint?In the electrolytic refining of a metal M, what would you take as the anode, thecathode and the electrolyte?The Sn in a 0.4352 g mineral specimen was reduced to the +2 state with Pb and titrated with 29.77 mL of 0.01735 M K2Cr2O7. Identify:1) balanced chemical reaction 2) oxidizing and reducing agent 3) type of redox titrimetry used4) appropriate indicator and its type 5) color at the end point6) % SnO2 in the sample.