Question

（2005?寧德）禽流感期間，某養(yǎng)殖戶需配制300Og2%氫氧化鈉溶液用以禽舍用具殺菌消毒，配制時(shí)需氫氧化鈉固體

60

 g、水

2940

mL（水的密度取1g/cm³）．

Answer 1

分析：依據(jù)溶質(zhì)質(zhì)量分的計(jì)算公式：溶質(zhì)質(zhì)量=溶液質(zhì)量×溶質(zhì)質(zhì)量分?jǐn)?shù)、溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量、m=ρV進(jìn)行計(jì)算．

解答：解：根據(jù)溶質(zhì)質(zhì)量=溶液質(zhì)量×溶質(zhì)質(zhì)量分?jǐn)?shù)可知，需氫氧化鈉的質(zhì)量=3000g×2%=60g；根據(jù)溶劑質(zhì)量=溶液質(zhì)量-溶質(zhì)質(zhì)量可知，需水的質(zhì)量=3000g-60g=2940g；
所以需水的體積為：V=

m

ρ

=

2940g

1g/ cm3

=2940cm³=2940mL．
故答案為：60；2940．

點(diǎn)評：熟練掌握溶質(zhì)的質(zhì)量分?jǐn)?shù)的計(jì)算公式，并能夠運(yùn)用該計(jì)算公式來求算溶液中溶質(zhì)和溶劑的質(zhì)量．