常温下两种溶液：①1mol·L－1的Na2CO3溶液，②1mol·L－1的NaHCO3溶液。下列对于这两种溶液的说法正确的是
| A．两种溶液中都存在：c(H＋)·c(OH－)＝1×10—14 |
| B．c(H2CO3)：①＞② |
| C．两种溶液中都存在：c(Na＋)＋c(H＋)＝c(OH－)＋c(HCO3－)＋2c(CO32－) |
| D．向②溶液中加入等体积的1mol·L－1的NaOH溶液，②溶液可以变成①溶液 |
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