00:02
Looking at the list of common active ingredients found in acids for a from the list were asked which of the compounds produce gas -forming reactions when combined with hcl.
00:15
So when combined with hcl, n -a -h -c -o -3, k -h -c -o -3, and c -a -c -o -3 produce carbon dioxide gas.
00:44
So those would be the three that would participate in a gas -forming reaction.
00:50
For part b, we're told that one tablet of tums regular strength contains 500 milligrams of calcium carbonate.
01:00
So for part one here, what's the balanced equation for calcium carbonate plus hcl? hcl would be present in stomach acid.
01:11
A balanced equation here.
01:12
Here and co2 gas so that would be for part one for part two what volume in militers of 0 .5 molar hcl would react completely with one tablet of tums so one tablet of thums so one tablet of tums we're told is 500 milligrams of caco3 which is a equivalent to .50 grams, a c .a .c .o .3.
01:59
So let's find the volume of the hcl that would react with this.
02:03
Starting from .50 grams, calcium carbonate.
02:10
And let's convert this to moles here.
02:18
100 .1 grams in one mole.
02:24
One mole.
02:26
C .a.
02:27
Co .3.
02:28
2 moles.
02:29
Of hcl and this would yield 0 .2, 9 .99 times 10 to the negative 3 moles of hcl.
02:50
And let's find the volume of hcl, which is equal to moles over the concentration, 9 .99 times 10 to the negative 3 moles, divided by 0 .503 moles, divided by 0 .50.
03:03
Molar is the concentration of the hcl and this would work out to 0 .0200 liters or 20 milliliters so 20 milliliters of 0 .5 molar hcl will react with one 500 milligram tom's tablet.
03:41
And for part c, the active ingredient in rolades are calcium carbonate and magnesium hydroxide.
03:57
Write the balanced equation for the reaction of magnesium hydroxide and hcl for part one.
04:02
Magnesium hydroxide and hcl.
04:08
And the magnesium hydroxide would be present as a solid.
04:12
Hcl would be iguice.
04:14
This would yield mgcl2 and h2o.
04:22
Balancing this, we'd need a two in front of the hcl.
04:34
For part two here, we're told that if 29 .52 milliliters of 0 .5 molar hcl is required to tetrate one tablet of rouleades.
04:44
The tablet of rouleades contains 500 milligrams, 550 milligrams of calcium carbonate.
04:50
What is the mass of magnesium hydroxide present in 1 ?2.
04:52
Tablet.
04:54
So let's find the from the titration data let's find the moles of hcl which would be equal to the malarity times the volume in liters.
05:08
02952 liters and this would be equal to 0 .01476 moles of hcl.
05:21
We're told that in roll aids there is 550 milligrams of calcium carbonate which would be 0 .550 grams of calcium carbonate we can find number of moles here so this would be 100 .1 grams in one mole this would be equal to 0 .00549 moles of caco3 so we know that that from part b above, reaction of calcium carbonate with hcl, so 0 .00549 moles of caco3, 1 mole of caco3 to 2 moles of hcl.
06:32
And this would be equal to 0 .0198 moles of hcl.
06:43
And this would be from the calcium carbonates this would be the hcl in total so this is due to the caco3 so the hcl neutralized from the magnesium hydroxide would be the amount total 0 .1476 moles minus 0 .09098 moles and this would be equal to .00378 moles of hcl due to the calcium or the magnesium hydroxide.
07:34
And now 0 .00378 moles of hcl, 2 moles of hcl to 1 mole of magnesium hydroxide...