Question

硝酸鉀可作為無土栽培的一種營(yíng)養(yǎng)液．配制2000g 溶質(zhì)質(zhì)量分?jǐn)?shù)為10%的硝酸鉀營(yíng)養(yǎng)液，需要稱取硝酸鉀的質(zhì)量為

1. A.
   20g
2. B.
   100g
3. C.
   150g
4. D.
   200g

Answer 1

D
分析：由溶質(zhì)質(zhì)量分?jǐn)?shù)的概念，根據(jù)溶液質(zhì)量和溶質(zhì)質(zhì)量分?jǐn)?shù)可計(jì)算出溶質(zhì)質(zhì)量．
解答：需要硝酸鉀的質(zhì)量為
2000g×10%=200g
故選D．
點(diǎn)評(píng)：本題主要考查溶質(zhì)質(zhì)量分?jǐn)?shù)的相關(guān)計(jì)算，培養(yǎng)學(xué)生的計(jì)算能力，此題難度較�。�