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in a gravimetric determination 4 of P , an aqueous solution of dihydrogen phosphate ion ( H2PO4 - ) is treated with a mixture of ammonium and magnesium ions to precipitate magnesium ammonium phosphate [ Mg( NH4)PO4,6H20 ]. This is heated and decomposed to magnesium pyrophosphate (Mg2P2O7), which is weighed . A solution of H2PO4- yielded 1.054 g of Mg2P2O7 . What weight of NaH2PO4 was present originally
Why do you require to acidify (add concentration hydrochloric acid) to the reaction mixture previous to crystallization (Preparation on benzoic acid use oxidation)
They have a polar end b. The have a hydrophobic end c. The are often sodium slats of long chain fatty acids. d. The hydrophilic end of the soap molecules is attracted by grease. e. they precipitate in water that contains Fe3+ ions
The initial concentration of the reactant A in a first-order reaction is 1.2M. After 69.3 s, the concentration has fallen to 0.3M. What is the rate constant k
Simple distillation and Fractional distillation which method is more appropriate for separating the two unknown hydrocarbons
A person ate 0.999 pound of cheese (an energy intake of 7990 kJ). Suppose that none of the energy was stored in his body. What mass (in grams) of water would he need to perspire in order to maintain his original temperature? (It takes 44.0 kJ to v..
A sample of 0.836 gm of unknown compound containing barium ions Ba2+ is dissolved in water and treated with an excess of Na2So4. If the mass of BaSo4 precipitat formed 0.7403 gm, what is the percent by mass of Ba in the orginal unknown compund
Organic chemistry mechanism and conceptual problems involving, 1. Write equations to show how nitronium ions might be formed using a mixture of nitric and sulfuric acids.
2 nas 2 h2ol 2 naohaq h2gthe hydrogen gas generated is collected over water at 25.0degc. the volume of the gas is 535
what does this chemical formula mean? can you break it down bit by bit?4kalsi3o8 4h 2h2o 4k al4si4o10oh8
How many moles of oxygen are needed to react with 5.0 moles of ammonia? In the above reaction, how many moles of water can be produced from 256 grams of oxygen?
Assuming the activation energies are equal, which of the following reactions will proceed at a higher rate at 50 degrees celsius? WHY?
what was your sampling rate to the nearest 1 ml/min over a four hour sample period if you collected 35 mg of carbon tetrachloride from a known concentration of 150 PPM?
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