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Chemistry
Chemistry
Problem
A student begins to balance the net ionic equation
S
r
2
+
+
P
O
4
3
−
→
S
r
3
(
P
O
4
)
2
(
s
)
Sr^{2+} + PO_{4}^{3-} \rightarrow Sr_{3}(PO_{4})_{2}(s)
S
r
2
+
+
P
O
4
3
−
→
S
r
3
(
P
O
4
)
2
(
s
)
and recognizes that a coefficient of 3 is needed in front of
S
r
2
+
Sr^{2+}
S
r
2
+
. In one sentence, explain why this coefficient is required.
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