【多选题】【消耗次数：1】
用两次测量法测定溶液pH的目的是（ ）
①
消除玻璃电极的酸差
②
消除玻璃电极的不对称电位
③
消除不确定因素产生的误差
④
稳定Ph
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相关题目
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用湿润的pH试纸测定溶液的pH，不变的是（）。
①
<img class="kfformula" src="20200629/1593410377146261.png" data-latex="{Na}_{2}{SO}_{4}" width="84" height="32"/>溶液
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