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浓度问题是百分数应用题的一种。在生活中,我们常常会碰到盐水、糖水、药水等溶液,它们是由盐、糖、药等溶质溶解在水中形成的,根据不同的需求,配成不同的浓度。它们有以下的数量关系:溶液的质量=溶质的质量+溶剂的质量浓度=溶质的质量÷溶液的质量×100%例1把5克盐放入95克水中,所配成的盐水浓度是多少?解析盐水的浓度是指盐的质量占盐水质量的百分比,盐有5克,盐水有5+95=100克,所以配成的盐水浓度是5÷100×100%=5%。
The concentration problem is one of the percent application questions. In our daily life, we often come across solutions of saline, syrup, syrup and the like, which are formed by dissolving solutes such as salt, sugar and medicine in water, and mixing them into different concentrations according to different needs. They have the following relationship: mass of solution = mass of solute + mass concentration of solute = mass of solute ÷ mass of solution x 100% Example 1 What is the concentration of 5g salt in 95g of water? The analytical brine concentration is the percentage of the mass of salt in the brine, 5 grams of salt, and 5 + 95 = 100 grams of salt water, so the concentration of the brine is 5 ÷ 100 × 100% = 5%.