Lab--I cant not figuar this out please help! Procedure..Tare the balance. Measure 1/4 teaspoon of baking soda and place into the cup on the balance. Determine nd record the mass of the baking soda....

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Lab--I cant not figuar this out please help! Procedure..Tare the balance. Measure 1/4 teaspoon of baking soda and place into the cup on the balance. Determine ndrecord the mass of the baking soda. Remove the entire cup containing the baking soda and replace it with a new cup. Retare the balance. Measure out 22 ml of vinegarusing medicine dropper and spoon. Place it into the new cup on the balance and determine and record the mass of the vinegar. Leave the cup containing the vinegar onthe balance. Add enough mass to the other side to include the mass of both the baking soda and the vinegar. (Your balance should be tipping away from the vinegar sidebecause the other side will contain the mass of both the vinegar and the baking soda.) Very slowly add the baking soda to the cupcontaining the vinegar. You will wantto add a little at a time because it will foam up and you want everything to stay contained in the cup and not overflow. After thereaction has gone to completion(about 5-10 mins), determine the mass of the materials in the reaction cup. You can do this two ways: 1) add or remove mass from the non-reaction side of the balance.2)add mass to the reaction cup until it balances with the non-reaction side. Repeat this process at least once. Performing it at least three times total is best. 1.Determine the molar mass of sodium bicarbonate (from periodic table) molar mass of Na____23______X 1 mol Na=_________ molar mass of H_____1_______X 1 mol H=__________molar mass of C_____12______X 1 mol C=__________ Molar mass of o______16______X 3 mol O=_________ Sum for the total molar mass _______________ 2.Determine the numberof moles of sodium bicarbonate in your sample of baking soda: Run 1 grams of sodium bicarbonate (from experiment: ____________ molar mass of sodium bicarbonate(divided) /____________ Number of moles of sodium bicarbonate _____________ Run 2 grams of sodium bicarbonate (from experiment) ____________ molar mass of sodiumbicarbonate (from #1 above) divided /____________ number of moles of sodium bicarbonate _____________ Run 3 grams of sodium bicarbonate (from experiment) _________molar mass of sodium bicarbonate (from #1 above) divided /_________ number of moles of sodium bicarbonate ____________ 3. Determine the mass of acetic used in theexperiment. If your vinegar is 4%, this means that every 100g of vinegar contains 4 g of acetic acid. (If it is 5% than 100 g contains 5 g of acetic acid) Run 1 4grams acetic acid = __?____grams acetic acid __________________________________ 100 grams of vinegar _________grams of vinegar (this is the mass of vinegar youmeasured in the 1st experiment.) Run 2 4 grams acetic acid =___?___ grams acetic acid _______________ _____________________ 100 grams of vinegar _______grams ofvinegar (This is the mass of vinegar you measured in the 2ndexperiment) Run 3 4 grams acetic acid = ____?___ grams acetic acid _______________ ______________________100 grams of vinegar _________Grams of vinegar 4. Determine the molar mass of acetic acid, C3H4O2. molar mass of C________ X 3 mol C=__________ molar mass ofH________X 4 mol H=__________ molar mass of O________X 2 mol=___________ sum for total mass_________ 5. Determine the number of moles of acetic acid in each sample ofvinegar. Run 1 grams of acetic acid (from #3 above): __________ molar mass of acetic acid (from #4 above) divided /_________ number of moles of acetic acid____________ Run 2 grams of acetic acid (from #3 above) __________ molar mass of acetic acid (from #4 above) divided /___________ number of moles of acetic acid__________ Run 3 grams of acetic acid(from #3 above) __________ molar mass of acetic acid(#4 above) divided /__________ number of moles of acetic acid __________6.Determine the total mass gain or loss for the reaction by comparing your initial mass (combined mass of baking soda and vinegar) to your final mass. Run 1: Run 2:Run 3 Initial total mass_________ Initial total mass______ Initial total mass_____ Final total mass_________ Final total mass______Final total mass______Difference_____________ Difference_________ Difference_________ 7.Calculate the molar mass of carbon dioxide. Molar mass of C_______ X 1 mol C=________ Molar mass ofO_______X 2 mol O=________ sum for total molar mass____________ 8.Determine the number of grams of carbon dioxide that the reaction should theoretically produce,remembering that one mole of acetic acid or sodium bicarbonate should produce one mole of carbon dioxide Run1 Moles of carbon dioxide* _________ molar mass of carbondioxide (from #7) X_________ grams of carbon dioxide (the product) _________ Run 2 moles of carbon dioxide* _________ Molar mass of carbon dioxide (from #7)X__________grams of carbon dioxide (the product) __________ Run 3 molesof carbon dioxide* __________ molar mass of carbon dioxide (from #7) X_________ grams of carbon dioxide(the product) __________ *moles of carbon dioxide=moles of acetic acid (from #5 above) Questions 1. Figure out why the mass increased or decreased. Correlate thisincrease or decrease to the products yielded by the reaction. Does the stoichiometry of the reaction (coupled with the results of the calculations above) account forall of the mass difference? Discuss possible reasons for anydiscrepancies. 2.In this particular example the change in mass through the course of the reaction providesevidence that a reaction is taking place. Is it necessary tohave a change in mass in order to have a reaction? Can you provide an example of a reaction where no masschange would be observed? 3.Explain how this particular reaction might by supportive of the phlogiston theory that was popular among scientists prior to the 18thcentury. Please help me! I am no good at Chem labs... :(
Answered Same DayDec 31, 2021

Solution

Robert answered on Dec 31 2021
27 Votes
For Baking Soda
Mass of cup having ¼ Teaspoon baking soda = m1 grams
Mass of empty cup =m2 grams
Mass of ¼ tablespoon baking soda= m1-m2= x grams.
For Vinegar
Mass of cup having 22ml vinegar = m3 grams
Mass of empty cup = m4 grams.
Mass of vinegar = m3-m4 = y grams.
Baking soda and vinegar react with each other because of an acid-base reaction. Baking soda is
a bica
onate (NaHCO3) and vinegar is a diluted acetic acid (CH3COOH). One of the products
this reaction creates is ca
on dioxide.


1.Molar mass of sodium bica
onate

Chemical Equation = NaHCO3

Symbol Element Atomic weight Atoms Total Atomic Weight
Of Element in Compound
Na Sodium 22.9897 1 22.9897
H Hydrogen 1.00794 1 1.00794
C Ca
on 12.0107 1 12.0107
O Oxygen 15.9994 3 47.9982

So molar mass of NaHCO3 = 22.9897+1.00794+12.0107+47.9982
= 84.00654
????
???

2.Number of moles of sodium...
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