to purchase it 的确错了,因为代词it 指代不明.
purchase 买,买的东西肯定是前面出现的chemicals,但chemicals 是复数形式,所以it和它无法形成指代关系.把it 改为them 还行.
What 有时候就等于how much
如：How much did you pay for the shirt?= What did you pay for the shirt?
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