重铬酸钾 K2Cr2O7 PH:3.8-4.0
亚硫酸氢钠 NaHSO3 PH:4.1-4.4
硫酸氢钠 NaHSO4 PH:0.8-1.2
磷酸二氢钙 Ca(H2PO4)2 PH:2.8-3.2 (3左右)
磷酸二氢铝 Al(H2PO4)3 PH:1.6-1.8
柠檬酸二氢钾 KH2C6H5O7 PH:3.5-3.8
顺丁烯二酸氢钠 NaHC4H2O4 PH:4.0-4.5
邻苯二甲酸氢钾 KHC8H4O4 PH:3.8-4.2
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