00:01
Hello student in this question a reaction is given that is twice of nah co3 is dissociating to form the na2 co3 which is solid along with it is forming the h2o as the vapor and along with the carbon dioxide gas and this is in the solid form in the first part of the question, what is the type of the reaction? so this is a decomposition reaction.
00:42
Coming to the next one, they have asked what will be left in the test tube at the end of the reaction.
00:49
You can see, they are forming two gases.
00:53
So these two gases will make effervescence and will be out of the test tube.
00:58
And this solid will only be left.
01:00
So we can say that the sodium carbonate will be left coming to the third one they have mentioned that how will one know that the reaction is complete when the reaction will happening then for the carbon dioxide we can see many effervescence are coming out and when you will see there is no effervescence then we can say that the reaction is complete so our answer will will be effort wascens.
01:37
Moving to the fourth one, what is one reason that the percent he will get that more than 100 percent of yield? because these gases are going outside the test tube, so they cannot be calculated as the part of the yield.
02:03
So we can say that as gas are present, which will not include in calculation.
02:25
Now moving to the next one, they have asked that how would the percentage yield will be affected if the sample is not heated enough? if the sample is not heated enough, then the gases will be within the solid substance itself that will be be affecting the percentage yield.
02:51
So no gas will be formed affecting percentage yield.
03:09
Now moving to the sixth part, it is said that the mass of the test tube, so the mass of the test tube plus sodium bicarbonate, that means, nah co3 is 19 .540.
03:28
151 grams and the mass of the only test tube is equal to 18 .002 grams and mass for the test tube plus sodium carbonate is equal to 18 .722 grams...