14 jobs in analytical chemistry (K / P 1, 1 Var, MGTA)

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Uploaded: 10.10.2012
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Task №1
What is the essence of a systematic course of analysis? What reagents called group? How, using acid-base method, divided cations Ag + and Pb2 +?

Task №11
The different dissociation in aqueous solutions of strong and weak electrolytes? Give examples of dissociation schemes. What is the activity?

Task №21
Calculate the volume of hydrochloric acid (p = 1,19 g / cm3), which you need to take to prepare 500.0 mL 0.5000 N. the solution?

Task №31
Calculate product of solubility of the compound MgNH4PO4, if 300.0 mL of a saturated solution contains 2.59 * 103 grams of salt (salt formula weight 137.4 g).

Task №41
Calculate the pH of a solution containing 1.00 g of hydrochloric acid in 1 liter of solution.

Task №51
What is the pH of the ammonium buffer mixture containing 0.1 mol of ammonia and salts. How to change the pH by adding to 1 liter of a mixture of 0.01 mol of sodium hydroxide? .

Task №61
What ml of 5% ammonia solution must take deposition of iron hydroxide 0.5263 g sample of ore containing 12% iron?

Task №71
How to pick the indicator in the titration of acids and alkalis? What's the point of equivalence?

Task №81
In the titration of 0.1560 g of sample reagent grade succinic acid consumed 25.00 ml of sodium hydroxide. Calculate the normality of sodium hydroxide and hydrochloric acid titer.

Task №91
In the titration of a solution containing 3.5580 g of a KOH, spent 28.00 ml of HCl titer NaOH 0,07492 g / ml. Calculate the percentage of KOH in a sample.

Setting №101
Describe the device to a standard hydrogen electrode. Standard potentials. Nernst equation.

Setting №111
Write the reactions that occur in the determination of the normality of sodium thiosulfate on potassium dichromate. What with potassium iodide used in excess? How important is the pH? Calculate the molar mass equivalent Na2S2O3 ∙ 5H2O in its reaction with iodine.

Setting №121
In the titration of 0.1136 g of reagent grade Na2C2O4 in acidic medium spent 20.75 ml KMnO4. Determine the normality of solution KMnO4 and the titer of iron.

Setting №141
Which reaction complexometric method based definition of water hardness? In what units is it expressed? Write the reaction equation III-ion chelator

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