300.0 ml of water is added to .40 L of a .400 M Na2CrO4 solution what is the molarity of the resulting solution?
Na2CrO4 = 2 Cr +Cr + 4 O's
Molar mass = (2*23 + 52 + (4*16) = 162
A .400 M N Na2CrO4 solution has .400 moles of Na2CrO4 in a liter of water.
.400 moles of Na2CrO4 = 0.400 * 162 = 64.8 grams of Na2CrO4 in a liter of water.
Since you only have .40 L, you have 64.8 grams/liter * 0.4L = 25.92 grams of Na2CrO4 in 0.4 liter of solution.
When you add 300.0 ml of water, you have total of 700 ml of solution.
You still have 25.92 grams of Na2CrO4, but now you have 700 ml of solution.
Molarity = moles of solute per liter of solution.
Moles of solute = grams of solute ÷ Molar mass of solute
Moles of solute = 25.92 ÷ 162 = 0.16 moles of Na2CrO4.
Molarity = 0.16 moles of Na2CrO4 ÷ 0.700 L of solution.
Molarity = 0.23 M
4.00 grams of NaOH have been added to 2.00 liters of water. The molarity of this solution is?
The pH is under 7.
Lithium fluoride has a solubility in water of 0.27 grams per 100 milliliters at 18 degrees Celsius. Its solubility drops to 0.134 grams at 25 degrees Celsius.Ê
Acetic acid is added to the solution, but the pH of the solution does not change. Sodium hydroxide, a base, is added to the solution, but the pH of the solution does not change.
Sodium carbonate is added to increase the pH of the solution.
If 1.8 L of water is added to 2.5 L of a 7.0 M KOH solution, what is the molarity of the new solution?
65
If a seed crystal was added to a supersaturated solution, the resulting solution would be a crystallized solution. The formation of solid crystals that precipitate from a solution is called crystallization.
molarity is #moles divide by # liters, so 3.0 divided by 0.500 is 6.0 molarity (2 siginficant figures is all you are allowed)
Molarity is calculated as moles of solute divided by volume of solution in liters. In this case, you have 2 moles of sodium chloride in a 0.5 liter solution. So the molarity would be 2 moles / 0.5 L = 4 M.
ammonium oxalate is added to calcium carbonate because in the reaction between the two a crystal is formed that contain the Ca+2 ion. This is useful because if you have a sample of sodium carbonate with an unknown molarity you can use the oxalate to extract this calcium and determine what the molarity of the unknown solution was
When each of the following is added to water, is the resulting solution acidic, basic, or neutral? a) HClO, b) NaCl, c) HCN, d) MgO, e) CH3OH
solution, a solid is disolved into a liquid
a homogeneos solution
The acid and base will neutralize each other and the resulting solution will be more neutral. If the base being neutralized is strong, the resulting salt will be neutral. If the base is weak the resulting salt will be acidic. A solution of such a salt may be called a buffer.
0.125M x 0.50L= .0625 mol x 118g= 7.4g KBr
[4.00 (g) / 40.0 (g/mol)] / 2.00 (L) = [0.100 (mol)] / 2.00 (L) = 0.0500 mol/L