98 mL
add 4 parts water per part solution
2 gallons.
684 ml
0.25 gallons of water (or 1 quart)
75 litres
About 80ml of water must be added to 40ml of a 25 percent by weight solution to make a 2 percent by weight solution.
add 4 parts water per part solution
Dissolve 15 g salt in 100 mL water.
Mix this 50% solution in equal quantities with water(?) to halve it's strength. So use 1 litre of the 50% solution and 1 litre of water of that's what you are diluting it with.
2 gallons.
To make a 2% solution from a 25% solution, you need to dilute it. Let x ml be the amount of water needed. Using the equation for mass balance: 0.25(40) = 0.02(40 + x), solve for x to find that x = 875 ml of water needs to be added.
684 ml
0.25 gallons of water (or 1 quart)
4 litres
First off do not use tap water. Use only distilled water. You will need to add 3 gallons of distilled water to the solution to get 60% antifreeze and 40% distilled water or a 60/40 mix.
75 litres
12*(90%)=10.8=X*.25 10.8/.25=X=43.2 43.2-12=31.2 31.2 grams of water must be added