阅读短文，下列问题
B
Amy
I like singing. I can play the guitar and the piano. I want to join the music club.
Bill
Do you want to know my favorite sport? I like playing basketball very much.
I can playing it well.
Jackie
I like playing the piano very much. I often play the piano after school.
Frank
My favorite sport is playing soccer, and I’m good at it.
酸
电离方程式
电离平衡常数K
CH3COOH
CH3COOH CH3COO－＋H＋
1.76×10－5
H2CO3
H2CO3 H＋＋HCO3－
HCO3－ H＋＋CO32－
K1＝4.4×10－7
K2＝4.7×10－11
H2S
H2S H＋＋HS－
HS－ H＋＋S2－
K1＝1.3×10－7
K2＝7.1×10－15
H3PO4
H3PO4 H＋＋H2PO4－
H2PO4－ H＋＋HPO42－
HPO42－ H＋＋PO43－
K1＝7.1×10－3
K2＝6.3×10－8
K3＝4.20×10－13
回答下列问题：
CH3COO－＋H＋