NaOH标准溶液滴定H3PO4至甲基橙终点时的质子条件式是
A: [H+]+[H3PO4]=[OH-]+[HPO42-]+[PO43-]
B: [H+]+[H3PO4]=[OH-]+[HPO42-]+2[PO43-]
C: [H+]+2[H3PO4]+[H2PO4-]=[OH-]+[PO43-]
D: [H+]+[Na+]=[OH-]+[H2PO4-]+2[HPO42-]+3[PO43-]
A: [H+]+[H3PO4]=[OH-]+[HPO42-]+[PO43-]
B: [H+]+[H3PO4]=[OH-]+[HPO42-]+2[PO43-]
C: [H+]+2[H3PO4]+[H2PO4-]=[OH-]+[PO43-]
D: [H+]+[Na+]=[OH-]+[H2PO4-]+2[HPO42-]+3[PO43-]
举一反三
- Na2HPO4的质子条件式是（） A: [H+]+ [H3PO4]= [HPO42-] + 2 [PO43-] +[OH-] B: [H+]+ [H3PO4]= [H2PO4-] + [PO43-] +[OH-] C: 2 [H3PO4] + [H2PO4-]+ [H+]= [PO43-] +[OH-] D: [H+]+ [H3PO4]= [HPO42-] + 2 [PO43-]
- Na2HPO4 水 溶 液 的 质 子 条 件 式 是 ： A: [ H+]+2[ H2PO4-]+3[H3PO4]=[PO43-]+[OH-] B: [ H+]+[ H2PO4-]+2[H3PO4]=[PO43-]+[OH-] C: [ H+]+[HPO42-]+2[H2PO4-]=2[ PO43-]+[ OH-] D: [ OH-]+3[ PO43-]= [ H+]+[HPO42-]+2[H2PO4-]
- Na2HPO4水溶液的质子条件式为 A: [H+]+[H2PO4-]+2´[H3PO4]=[OH- ]+[PO43-] B: [H2PO4-]+2´[H3PO4]=[PO43-] C: [H+]+[H2PO4-]+[H3PO4]=[OH- ]+[PO43-] D: [HPO42-]+[H2PO4-]+2´[H3PO4]=[PO43-]
- NH4H2PO4水溶液PBE是： A: [H+] + [NH4+] = [OH-] + [HPO42-] + 2[PO43-] B: [H+] + [H3PO4] = [OH-] + [H2PO4-] + [HPO42-] + [NH3] C: [H+] + [H3PO4] = [OH-] + [HPO42-] + [PO43-] + [NH3] D: [H+] + [H3PO4] = [OH-] + [NH3] + [HPO42-] + 2[PO43-]
- (NH4)2HPO4水溶液的质子条件式（PBE）为（ ）。 A: [H+]+[H2PO4-]+[H3PO4] =[OH-]+[NH3] +[PO43-]； B: [H+]+[H2PO4-]+2[H3PO4] =[OH-]+[NH4+] +[PO43-]； C: [H+]+[H2PO4-]+2[H3PO4] =[OH-]+[NH3] +[PO43-]； D: [H+]+[H2PO4-]+[H3PO4] =[OH-]+[NH3] +[HPO42-]。