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Molarity

Q. An aqueous solution is 36.0% by mass potassium bromide, KBr, and has a density of 1.33 g/mL. The molarity of potassium bromide in the solution is ___ M.

Solved • Aug 30, 2019

Molarity

Q. An aqueous solution is 18.0% by mass ammonia, NH3, and has a density of 0.929 g/mL. The molarity of ammonia in the solution is ____ M.

Solved • Aug 30, 2019

Molarity

Q. How many moles of solute particles are present in 1.43 mL of 0.447 M K2SO4? When you have your answer, take the LOG (base 10) of your answer and enter it with 2 decimal places.

Solved • Aug 28, 2019

Molarity

Q. A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions 1.50 M? express your answer to three significant figures and include the appropriate units.

Solved • Aug 28, 2019

Molarity

Q. A scientist wants to make a solution of tribasic sodium phosphate, Na3PO4, for a laboratory experiment. How many grams of Na3PO4 will be needed to produce 400 mL of a solution that has a concentration of Na+ ions 1.50 M? express your answer to three significant figures and include the appropriate units.

Solved • Aug 28, 2019

Molarity

Q. If CaCl2 is dissolved in water, what can be said about the concentration of Ca2+ ion?

Solved • Aug 28, 2019

Molarity

Q. Experiments with rats show that if rats are dosed with 3.0 mg/kg of cocaine (that is, 3.0 mg cocaine per kg of animal mass), the concentration of dopamine in their brains increases by 0.75 uM after 60 seconds. Calculate how many molecules of dopamine would be produced in a rat (average brain volume 5.00 mm^3) after 60 seconds of a 3.0 mg/kg dose of cocaine?

Solved • Aug 10, 2019