Name _______________________

    Chemistry 101     Lab Quiz # 4      Nov 30, 1998    Dr. B. Jackson



1. _____________ To determine the normality of a solution of NaOH, 3.06 grams of potassium
hydrogen phthalate (MW204) was dissolved in 50 mL water.  It took 30 mL of the NaOH
solution to neutralize the phthalate.  What is the normality of the NaOH solution?

2. ___________ In the above example, the potassium hydrogen phthalate is
               a) primary standard   b) secondary standard   c) a base

3. ___________ 20 milliliters of  NaOH solution was neutralized by 15 mL of  0.25 N HCl.
             What is the normality of the NaOH?

4.___________ How many milliliters of a 2.0 N solution of HCl would it take to neutralize
                         50 milliliters of a 4.0 N NaOH solution?


   Given the following information.   An evaporating dish (A) weighed 210 grams empty.  A 
mixture of  ammonium chloride, sodium chloride and sand was placed in the evaporating dish A
and reweighed.  It now weighed 225 grams.  Dish A was heated and white fumes were given off.
Dish A now weighed 223 grams.  Water was added to the remaining substances in Dish A.  The
water was poured off  into Dish B which weighed 200 grams empty.  Dishes A and B were heated
to dryness and reweighed.  Dish A weighed 217 grams.  Dish B weighed 206 grams.

5. _________ What is the formula for sand?

6. __________ What was the fumes given off  in the first heating?

7. __________ What is the percent ammonium chloride in the mixture?

8. __________ What is the percent sodium chloride in the mixture?

9. _______________ What is the term used to describe when a solid passes to the gaseous state            without going to the liquid state?

10. ________Freebie