A tank contains 10kg of sodium hydroxide in 1000 litres of water. Water is continuously added to the tank at a rate of 5 litres/min so that the mixture is diluted evenly. At the same time, the solution flows out at the same rate. Initially, there were 10g of NaOH in every litre of water. How long will it take for the concentration of the solution to drop to 3.2g/litre?
hlp me solve it~~TQ^^
发表于 18-10-2011 10:10 PM
变色卡
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