Concentration Practice Problems Flashcards
Danika mixed 70g of lemonade in 900ml of water since she liked very plain lemonade for her sensitive taste buds. This means the drinks concentration should be 0.77g/ml. True or False?
False.
70g/900ml=7.7g/100ml
Hunter dissolves 76 ml of Hot Chocolate mix into 150 ml of cold water. What is the concentration percentage?
76ml/150ml=0.506 x100 = 51%
Elena wants to set up a lemonade stand to make some money. She discovers that the customers like a 25% concentrated solution the best. If she makes 1L of juice, how many ml of solute should she add?
1L=(1000ml) x 0.25 = 250ml of solute
If Bella the good witch needs her potion of unicorn tears to be 37% tears and 63% river water. How much of each must she add to a 250ml solution?
250ml x 0.63= 157.5ml
250ml x 0.37= 92.5ml
Bella will need 157.5ml of river water, and 92.5ml of unicorn tears.