### How many milligrams of salt must be added to 18 milligrams of a 20 percent salt solution to obtain a 35 percent salt solution?

this question is not hard to answer, but it does require that one make some assumptions. The simplest answer assumes that the 20% salt solution refers to per cent by mass. Thus: a 20% salt solution is one which contains 20 mg salt for every 100 mg solution where the solution consists of a mixture of 20 mg salt plus 80 mg water. A 35% salt solution would contain 35 mg salt for every 65…

### Why does salt make the ice melt faster?

Salt lowers the freezing/melting point of water, so in both cases the idea is to take advantage of thelower melting point. Ice forms when the temperature of water reaches 32 degrees Fahrenheit (0 degrees Celsius). When you add salt, that temperature drops: A 10-percent salt solution freezes at 20 F (-6 C), and a 20-percent solution freezes at 2 F (-16 C). On a roadway, this means that if you sprinkle salt on the ice…

### A chemist needs 4 liters of a 50 percent salt solution All she has available is a 20 percent salt solution and a 70 percent salt solution How much of each of the two solutions should she mix to obtain?

You will need more data about all densities (in kg/Litre) and you must be sure of using mass% = (g solute)/(100 g solution) Solve two equations for both X and Y: 4*d50*50 = X*d20*20 + Y*d70*70 (based on salt mass balance in diff. sol'n.) 4*d50 = X*d20 + Y*d70 (based on solutions mass balance) In which: dm = density of the 'm'% salt solution in kg/Litre) X and Y = volume of the 20% and…

### How does sprinkled salt melt ice on the road?

Ice forms when the temperature of water reaches 32 degrees Fahrenheit (0 degrees Celsius). When you add salt, that temperature drops: A 10-percent salt solution freezes at 20 F (-6 C), and a 20-percent solution freezes at 2 F (-16 C). On a roadway, this means that if you sprinkle salt on the ice, you can melt it. The saltdissolves into the liquid water in the ice and lowers its freezing point.

### Will a saturated solution remain saturated after heating?

A saturated solution will gradually lose the solute as it cools. Heated solvents are able to carry more solutes because there is more space between the molecules. - - - - - From the looks of the question, you've got a solution (let's make it easy and say you have some salt water) that's saturated at 20 degrees C, and you want to heat it to 80 degrees C. If you heat the salt water…

### How do you make a 10 percent salt solution using a gallon container this is urgent?

You will need additional equipment if you start from solid salt and need exactly 10% solution. But if this is not a serious exact 10%, say 10 - 12 %, then this is another matter. First, soak the salt in the water overnight, you will need to add around 1/2 salt into the gallon and fill the rest with water. The saturate salt solution is about 38% volume and density around 1.2 kg/L. Scoop out…

### How many ml of a 20 percent solution should be added to 50 ml of a 40 percent solution to obtain a 25 percent solution?

150 ml Let x be the volume of 20% solution to add. The amount of "stuff" dissolved in the 20% solution plus the amount in the 40% will equal the amount of "stuff" dissolved in the 25% solution. (0.20)(X) + (0.40)(50 ml) = (0.25)(X+50ml) 0.2X + 20 = 0.25X + 12.5 20 - 12.5 = 0.25X - 0.20X 7.5 = 0.05X X = 7.5/0.05 = 150 ml

### What would happen if a dialysis bag filled with distilled water was replaced with 20 percent solute solution?

You'd kill the patient in either case. I read the instructions on the dialysis machine Fresenius sells for home use. The bag is supposed to contain saline. (They also use reverse-osmosis water, but that comes in through a different port.) Dialysis is a very complex balancing act, and NaCl level in the dialysis solution is a big part of the balance. If it gets too low, it'll suck the salt out of the patient's blood…