健康人的体液必须维持在一定的酸碱度范围内.以下是几种人体体液

健康人的体液必须维持在一定的酸碱度范围内.以下是几种人体体液的正常pH范围,其中酸性最强的是(  )

A.胆汁(7.1~7.3) B.唾液(6.6~7.1)

C.胃液(0.9~1.5) D.血液(7.35~7.45)

答案

【考点】溶液的酸碱性与pH值的关系.

【专题】常见的酸 酸的通性.

【分析】可以根据溶液的pH与溶液的酸碱性关系进行分析和判断,当pH=7时,呈中性,当pH<7时,呈酸性,当pH>7时,呈碱性,当溶液的PH小于7时,随着PH的减小,酸性逐渐增强.

【解答】解:根据四种物质的pH可知,胃液的pH最小,酸性最强,观察选项,胃液酸性最强.

故选C.

【点评】本题主要考查了溶液的酸碱性强弱与溶液的pH大小的关系,完成此题,可以依据已有的知识进行.

 

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