The steps for preparing a soluble salt are shown in the flow diagram.What is removed from the mixture during the filter step?
Question 1 Report
The steps for preparing a soluble salt are shown in the flow diagram.
What is removed from the mixture during the filter step?
Answer Details
In this route the base is added in excess so that every last bit of acid is used up. That deliberately leaves some solid base sitting in the mixture, and since it is insoluble it can be trapped by filter paper. The filter step therefore removes the unreacted excess base, and the filtrate that passes through is a solution of the salt in water.
The water and the dissolved salt both pass straight through the paper, which is why the next steps are evaporate and crystallise. The acid cannot be removed here because none is left; it was all neutralised, which is the whole reason for adding the base in excess in the first place.
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