#130 A series of sulfate samples is to be analyzed

A series of sulfate samples is to be analyzed - Inorganic Chemistry

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A series of sulfate samples is to be analyzed by precipitation as BasO4. If it is known that the sulfate content in these samples ranges between 20 and 55%, what minimum sample weight should be taken to ensure that a precipitate weight no smaller than 0.300 g is produced? What is the maximum precipitate weight to be expected if this quantity is taken?
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Free Chegg Answer

According to the data, we know that the minimum range is 20% and the maximum is 55%. Now, if the minimum should be 0.300 g, means that this quantity belongs to the 20% so:
0.300 g --------> 20%
X ----------------> 100%
X = 0.300 * (100/20) = 1.5 g of sample
For the maximum it should be:
Y = 1.5 g * (55/100) = 0.825 g
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