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Lab 3

front 1

In this experiment, all the acid added is neutralized by

back 1

an antacid and sodium hydroxide

front 2

In reading a buret, you should always

back 2

read the bottom of the meniscus

front 3

The purpose of Trial T is

back 3

to get an idea of the expected end-point and the amount of HCl to add in subsequent trials

front 4

When you react hydrochloric acid and sodium hydroxide you get

back 4

a salt and water

front 5

An antacid tablet was dissolved in water and 10mL of 0.16M HCl was added. After the acid had reacted with the tablet it required 40mL of 0.02M NaOH to neutralize the HCl that remained.
How many moles of HCl were initially added to the antacid?

back 5

1.6x10-3

front 6

An antacid tablet was dissolved in water and 10mL of 0.16M HCl was added. After the acid had reacted with the tablet it required 40mL of 0.02M NaOH to neutralize the HCl that remained.
How many moles of NaOH were required to neutralize the HCl that remained after it had reacted with the tablet?

back 6

8.0x10-4

front 7

To determine the number of moles of acid that were initially added to the Erlenmeyer

back 7

multiply the molarity of the HCl by the volume in Liters of HCl added

front 8

How is the number of moles of acid neutralized by the antacid determined in this experiment

back 8

moles of acid added - moles of acid remaining

front 9

When the phenolphthalein changes color, then

back 9

the amount of NaOH added is just sufficient to react with all the acid present

front 10

In this experiment what do you use to dispense the acid into the Erlenmeyer flask

back 10

a repipet

front 11

The reaction:
HCl(aq) + NaOH(aq) = NaCl(aq) + H2O(l)
is an example of a(n)

back 11

acid-base reaction

front 12

When the following chemical equation is balanced:
__Mg(OH)2(s) + __HCl(aq) = __MgCl2(aq) + __H2O(l)
The stoichiometric co-efficients are:

back 12

1 2 1 2

front 13

The purpose of this experiment is to

back 13

determine the number of moles of acid neutralized by an antacid tablet

front 14

back titration is used in this experiment. This is because

back 14

many antacids contain more than one active ingredient

front 15

When the tablet has reacted completely with the acid

back 15

some inert binder will remain in the flask and the solution may be cloudy

front 16

An antacid tablet was dissolved in water and 10mL of 0.16M HCl was added. After the acid had reacted with the tablet it required 40mL of 0.02M NaOH to neutralize the HCl that remained.
How many grams of HCl (Molar Mass = 36.5 g/mol) did the antacid neutralize?

back 16

0.029

front 17

Which of the following is not a common active ingredient in commercial antacids

back 17

NaOH

front 18

What is the approximate molarity of the HCl used in this experiment

back 18

1M

front 19

An antacid tablet was dissolved in water and 10mL of 0.16M HCl was added. After the acid had reacted with the tablet it required 40mL of 0.02M NaOH to neutralize the HCl that remained

How many moles of HCl did the antacid neutralize

back 19

8.0x10-4

front 20

If during Trial P, upon addition of only a few mL of NaOH the indicator changes color you should

back 20

add more HCl, reheat, and continue with the titration