Problem: Balance the following equations by inserting the proper coefficients.15. ___ H3PO4 + ____ NaOH → _____ Na3PO4 + ____ H2O16. ___ Pb(NO3)2 + ___ KI → ___ PbI2 + ___ KNO3

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We’re being asked to balance the given equations.


Recall that when balancing chemical equations, we have to make sure that the number of elements on both sides is equal with the lowest whole number coefficients.


Reaction 1:

____ H3PO4 + ____ NaOH → _____ Na3PO4 + ____ H2O

H         4

P         1
O         4 + 1 = 5
Na       1

H         2

P         1
O         5
Na       3


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Problem Details
Balance the following equations by inserting the proper coefficients.

15. ___ H3PO4 + ____ NaOH → _____ Na3PO4 + ____ H2O
16. ___ Pb(NO3)2 + ___ KI → ___ PbI2 + ___ KNO3

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