a large amount of potassium in plant food could cause the formation of MgKPO4:6H2O along with MAPH. what would be the effect on the calculated percentage of P2O5 in question 1 if MAPH were mixed in with your precipitate? would the %P2O5 in this mixture be higher or lower than if your precipitate contained only MAPH?

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Since MKPH is insoluble too, it may ppt along with the MAPH. So which weighs more? If all of the ppt was MAPH it would weigh x amount; if all were MKPH it would weigh more. Right? The molar mass MAPH is ? and the molar mass MKPH is ?.