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A mixture of two miscible solvents that may be used as the solvent for a recrystallization experiment would be which of the following:
a.) One solvent cannot dissolve the sample when cold but can when hot
b.) One solvent cannot dissolve the sample when hot but can when cold
c.) One solvent cannot dissolve the sample when cold but slightly when hot
d.) One solvent cannot dissolve the sample if polar
e.) One solvent cannot dissolve the sample if non polar
A pound of coffee beans yields 70 cups of coffee (4 cups = 1 qt). How many milliliters of coffee can be obtained from 1.0 g of coffee beans.
calculate the molar change in chemical potential of an ideal gas that expands 10 times of its original vol. at 100k
What is the Molarity of a solution prepared by diluting 55mL of .65 M hydrochloric acid solution to a final volume of 155mL by adding water.
Predict whether a precipitation reaction will occur when aqueous solutions of the following substances are mixed:
An average adult inhales a volume of 0.50 l of air with each breath. if the air is warmed from room temperature (20c) to body temperature (37c) while in the lungs.
Determine what concentration of OH - is needed to dissolve 0.015 mol of Zn(OH) 2 zinc hydroxide in a liter of solution
Consider 48.5 mL of a solution of weak acid HA (Ka = 1.00 * 10-6), which has a pH of 4.350. What volume of water must be added to make the pH = 6.000?
Determine whether sodium monohydrogen phosphate (Na2HPO4) is neutral, basic, or acidic. First, what is its Ka when it acts as an acid? Second, what is its Kb when it acts as a base?
Write the carbon first and the H second in the formula and use the underscore key to denote subscripts in the formula.
KOH was used to titrate 25.0ml of HF. How many moles of KOH were used? How many moles of acid were titrated? What is the concentration of the HF?
Three sparingly soluble salts, MA, MA2, and MA3, all have Ksp = 1.5 x 10-7. Determine which of these three has the highest molar solubility in water? a) MA, b) MA2, c) MA3 ,d) They are all equally insoluble.
A solution that has a K+ concentration of 5.00ppm is to be prepared from solid KCl. Assuming a solution density of1.000g/mL how many miligrams of KCl must be added to make 1.00L solution?
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