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A^x + B^y -> AyBx
misal
2H^+ + SO4^2- ->H2SO4
2Fe^3+ + 3SO4^2- ->Fe2(SO4)3
muatan ion nya brp d silangkan
yg no 2 B
karena Al memiliki valensi 3
P bervalensi 3 atau 5 pd umumnya