Technically you don't know because the solution volumes are not additive; i.e., 10 mL + 90 mL is not 100 mL. However, the author of the problem meant this to be a 10 to 100 dilution which is a dilution of 10x so the 40 mg/L must be 10 x stronger or 400 mg/L.
b. 400 mL/L x 1.5 L = ?
And by the way that is 1.5 L and not 1.5l.
A Stock solution has a total volume of 1.5l. It is diluted by removing 10 ml of the stock and adding 90 ml of water. the diluted solution has a concentration of the solute of 40mg/l
a, what is the concentration of the solute in the stock solution?
b, How much solute is present in the total 1.5l of stock?
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