00:01
Here in this problem, we have to determine the mass in grams of the precipitate when 78 .8 millimeters of 0 .0 .023 moles of sodium carbonate react to it excess calcium hydroxide.
00:16
Now, let's write the equation for the reaction between calcium hydroxide and sodium carbonate.
00:30
And the precipitate is calcium carbonate.
00:38
And the other product is n -a -o -h and to balance let's place two here so both sides of the equation have two sodium atoms one carbonate, one carbonate and one calcium on the reactant side one calcium on the product side that's fine with the calcium 2 -o -h here 2 -o -h here so oh -h also balanced so this equation is balanced here we see one mole calcium hydroxide reacts with one mole n .a .2.
01:18
Co3 and one mole precipitated calcium carbonate s -4.
01:24
Now first here we'll find out moles of na2 -co -3 given.
01:30
Moles of sodium carbonate.
01:34
And that will be volume of sodium -carbonate solution in liters times smaller concentration.
01:42
Volume is 78 .8 milliliters.
01:45
If you divide by thousand, we get 0 .0778 liters because 1 liter is 1 ,000 milliliters...