4. Phosphate is precipitated from its solution with ammonium molybdate, as (NH4)a[PMO12O40 XH20]. Since the precipitate does not have a constant composition with regard to water content, it is dissolved in ammonia and the molybdate is precipitated with Pb(NO3)2, as PbMoOs. (a) What is the value of the gravimetric factor for the calculation of %P? (b) If the final precipitate weighs 0.100 g, what is the weight of P in the initial sample?

4. Phosphate is precipitated from its solution with ammonium molybdate, as (NH4)a[PMO12O40 XH20]. Since the precipitate does not have a constant composition with regard to water content, it is dissolved in ammonia and the molybdate is precipitated with Pb(NO3)2, as PbMoOs. (a) What is the value of the gravimetric factor for the calculation of %P? (b) If the final precipitate weighs 0.100 g, what is the weight of P in the initial sample?

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter12: Chemical Equilibrium

Section12.3: Determining Equilibrium Constants

Problem 12.3PSP

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