Molarity
The relationship between molarity and volume of solution:
What is inverse?
The dissociation equation for Cu(NO3)2:
What is: Cu(NO3)2 --> Cu2+ + 2 NO3- ?
The values subtracted to determine the amount of water that should be added to produce the desired diluted molarity:
What are V2 and V1?
When making up a standard solution, the piece of equipment that must ALWAYS be used:
What is a volumetric flask?
Daily Double!!!: The molarity for ∆G at standard conditions:
What is 1.0M?
12g of H2SO4 is creates a solution with a molarity of 0.90M. The concentration of H+ ions:
What is 1.8M?
If a student is diluting a 0.50L 3.69M KCl solution and adds 30.mL of water, what is the new concentration?
What is 3.5M?
True or false: After adding the calculated grams of solute to the volumetric flask, you should immediately fill it the rest of the way until you reach the etched line.
What is false? (A small amount of distilled water should first be added to fully dissolve the solute, then the volumetric flask can be filled to the etched line).
The evaporation of a solution has this effect on molarity:
What is it increases the molarity?
True or False: If the reactant of the dissociation equation has a coefficient of 1 but the product worked towards has a coefficient of 2, the molarity of the product will be half that of the reactant.
What is false (the molarity will be double that of the reactant)?
Mrs. Thomas is diluting solutions for lab day! If the original solution was 2.0L and she created a 16L solution with a molarity of 3.0M, the molarity of the original solution:
What is 24M?
True or False: When filling a volumetric flask, water should be added to the top of the neck.
What is false? (water should be added to the etched line in the neck of the flask).
Briahna has massed out 27.4g NaCl to make a 2.0 M solution. The volume of solution:
What is 0.23L (230mL)?
If 34.02g NaCl dissolved to form a 3.02 L solution, the concentration of Na+ ions in the solution:
What is 0.193M?
A student is diluting a solution for a colorimetry lab. The desired molarity of the solution is 4.70M. Using the original solution's molarity and volume, the student calculates V2 and adds that amount of water to the original solution. However, when the student places the sample in the colorimeter the dot produced on the graph has a much lower absorbance value than expected. The error the student made in his procedure:
What is he added an amount of water equal to the value of V2 instead of subtracting the value of V1 from V2 first?
A student is making a 2.00L standard solution of 0.760M NaCl. First, the student adds 2.00L of water to a beaker. Then, the student weighs out 88.8g of NaCl and stirs it in. The step(s) the student did wrong are:
What are used a beaker instead of a volumetric flask and added 2.00L of water instead of adding the massed NaCl to a volumetric flask and filling to the 2.00L graduation line.
A student has 3000cm³ of a 6.00 M solution. The number of moles of solute in the solution:
What are 20 moles of solute (18 moles without sigfigs)?
Daily Double!!!: The dissociation equation of HF (consider the majority behavior).
What is does not exist/occur? (HF is a weak acid and therefore less than 5% of its ions dissociate. As a result, the acid would be considered a non-electrolyte as the majority of its ions will not separate).
A student is trying to dilute a 2L 16.0 M HCl solution to a 4.0M HCl solution. The amount of water she should add in milliliters:
What is 6000mL?
A student is preparing a standard solution of 1.0M CaCl2 for a soap scum precipitation experiment. The student uses a volumetric flask, masses out the proper grams of solute, and fills the volumetric flask to the etched line with water from the sink. When she performs the experiment; however, it forms more precipitate than stoichiometry predicted. The error in the procedure that could have caused this is:
What is she used sink water which introduced more ions into her solution.