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Chemistry
Chemistry
Problem
A buffer is made from 0.10 M NaH₂PO₄ and 0.10 M Na₂HPO₄. When a small amount of NaOH(aq) is added, which balanced net ionic equation occurs? a)
H
2
P
O
4
−
⇌
H
P
O
4
2
−
+
H
+
\mathrm{H_2PO_4^- \rightleftharpoons HPO_4^{2-} + H^+}
H
2
P
O
4
−
⇌
HP
O
4
2
−
+
H
+
b)
2
O
H
−
+
H
2
P
O
4
−
→
P
O
4
3
−
+
2
H
2
O
2\,\mathrm{OH^- + H_2PO_4^- \rightarrow PO_4^{3-} + 2\,H_2O}
2
O
H
−
+
H
2
P
O
4
−
→
P
O
4
3
−
+
2
H
2
O
c)
O
H
−
+
H
2
P
O
4
−
→
H
P
O
4
2
−
+
H
2
O
\mathrm{OH^- + H_2PO_4^- \rightarrow HPO_4^{2-} + H_2O}
O
H
−
+
H
2
P
O
4
−
→
HP
O
4
2
−
+
H
2
O
d)
O
H
−
+
H
P
O
4
2
−
→
P
O
4
3
−
+
H
2
O
\mathrm{OH^- + HPO_4^{2-} \rightarrow PO_4^{3-} + H_2O}
O
H
−
+
HP
O
4
2
−
→
P
O
4
3
−
+
H
2
O
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