How much water do you need to add

1.) You have 100 ml each of 400 mg/ml sodium phosphate, 250 mg/ml sodium chloride, and 100 mg/ml potassium nitrate. You want to make one liter of a solution containing 10 mg/ml sodium phosphate, 10 mg/ml sodium chloride, and 10 mg/ml potassium nitrate. How much of each starting solution do you need to use, and how much water do you need to add?

2.) You have 100 ml each of 50 mg/ml human chorionic gonadotropin, 25x HCG buffer, and 400 mM potassium chloride. You want to make one liter of a solution that is 1 mg/ml human chorionic gonadotropin, 1x HCG buffer, and 40 mM potassium chloride How much of each starting solution do you need to use, and how much water do you need to add?

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