How many milliliters of 0.05 M EDTA are required to react with the calcium and magnesium in a 0.1414 g sample that is 92.4% dolomite, CaCO3 · M9CO3 (FM: 184.4 g/mol)?
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- Ferric oxide (Fe2O3, density 5 5.24 g/mL) obtained from ignition of a gravimetric precipitate weighed 0.296 1 g in the atmosphere. What is the true mass in vacuum?The electrical resistance of a column of 0.05 M NaOH solution of diameter 1 cm and length 50 cm is 5.55 × 103 ohm. Calculate its resistivity, conductivity and molar conductivity.Magnesium Chloride is available as magnesium chloride hexahydrate in an injectable solution that supplies 1.97 mEq of magnesium per milliliter. What is the percent strength of magnesium chloride hexahydrate in this solution?
- For EDTA,what is meant by aY4- and how does it vary with pH?To each digestion flask 200 mL aliquots of 10 different drinking water samples were added. Silver was extracted by a co-precipitation procedure and collected by filtration. The precipitate was digested in 200 μl hot concentrated nitric acid and diluted to 5 mL in a dilute phosphate solution. Standards were prepared according to the following table. The samples were analyzed by graphite furnace AAS. Calculate the concentration of silver in each sample. Are there any problems? How will you address each of the identified problems?An exhausted zeolite softener was regenerated by passing 100 litres, of NaCl. Solution containing 150 gm per lit. of NaCl. How many lit. of a sample of H2O of hardness 300 ppm can be softened by this softener? (Given at wts. for C = 12, O = 16, Na = 23, CI = 35.5, Ca = 40).
- A 1.1324 g sample of magnetite ore was dissolved in concentrated HCl to give a solution that contained a mixture of Fe2+ and Fe3+. Nitric acid was added and the solution was boiled for a few minutes, which converted all of the iron to Fe3+. The Fe3+ was then precipitated as Fe2O3*xH2O by addition of NH3. After filtration and washing, the residue was ignited at a high temp to give 0.5394 g of pure Fe2O3. What is the percent Fe and the percent Fe3O4 in the sample?calculate the equivalent weight of KMnO4 in alkaline medium.If 2.376 g of steel gave 0.402 g of Ni(DMG)2, what is the wt% Ni in the steel?
- 6. What is the pH of bleach with [H3O+] = 4.2 × 10–12 M?Solutions of Cu (NO3)2, FeCl3, and CaCO3 of the same concentration are added to identical samples of silica sols with a positive charge of counterions. Which of the ions of these electrolytes will cause coagulation of the sol? What electrolyte is needed less?Using the SONOX process, how much limestone would be required each year in order to effect quantitative removal of sulfur dioxide from a power plant whose daily consumption of coal (1.5% sulfur) is 6000 t?