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Reviewed CSCA STEM Chinese question · Easy

在化学实验中,用pH试纸测定溶液的酸碱度时,正确的操作是:用洁净的玻璃棒蘸取少量待测液,滴在pH试纸上,然后与标准比色卡对比,读出pH值。若某溶液的pH为3,则该溶液呈性。

  1. 强碱
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Correct answer

C.

Principle or equation

pH值是表示溶液酸碱性的指标,pH小于7为酸性,等于7为中性,大于7为碱性。

Why this answer is correct

pH为3,小于7,因此溶液呈酸性。

Example

例如,pH=1的溶液为强酸性,pH=6为弱酸性,pH=7为中性,pH=8为弱碱性,pH=14为强碱性。

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