原溶液的物质的量溶度：c( NaOH ) = 60 / (40 * 0.3) =5 (mol/L)
1 * 1000 = 5 X
X = 1000 / 5 = 200 (ml)
欲配1 (mol/L) 氢氧化钠溶液 1000ml
则需吸取原溶液 200ml,加蒸馏水 800ml 即可.