The task of analytical chemistry 35

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0,703 g cleaning solution ignited for the destruction of organic matter. The residue is then treated with hot HC1 to transform R in Н3РО4. Phosphate besieged in МgNН4РО4*6H2O by addition of Mg2+, followed by neutralization with an aqueous solution ,of Mnz. After filtration and washing of the precipitate was transferred to Мд2Р2О7 calcining at 1000°C. the Mass of the resulting precipitate 0,432 g. Calculate the percentage of P in the sample:

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