1. A student attempted to identify an unknown compound by the method used in thi
ID: 483727 • Letter: 1
Question
1. A student attempted to identify an unknown compound by the method used in this experiment. She found that when she heated a sample weighing 0.5032 g, the mass dropped to 02663 g. When the produet was converted to a chloride, the mass went back up to 0.3747 g a is the sample a carbonate? Yes/no (Circle one) Please provide your reasoning below. What are the two compounds that might be in the unknown? c. Write the balanced chemical equation for the overall reaction that occurs when each of these two original compounds is converted to a chloride, Ifthe compound is a hydrogen carbonate, usc the sum of Reactions land 2.1f the sample is a carbonate, use Reaction 2. write the equation for a sodium salt and then for a potassium salt. d. How many moles of the chloride salt would be produced from one mole of the original compound? e. How many grams of the chloride salt would be produced from one molar mass of the original compound? Molar masses: NaHco, g/mol Nasco, gmol Naci g/mol g/mol mol KCl If a sodium salt. g original compound g chloride g chloride original compound If a potassium salt, (continued on following page) Ibooks/9781305446366/print?from 33&to; 33Explanation / Answer
A student attempts to identify an unknown compound by the method used in this experiment. She finds that when she heated a sample weighing 0.4862 g the mass barely changed, dropping to 0.4855 g. When the product was converted to a chloride, the mass went up, to 0.5247 g.
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b. What are the two compounds that might be in the unknown? KHCO3 and NaHCO3
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2NaHCO3-->Na2Co3 + Co2 +H2o
2KHCo3-->K2Co3 + Co2 +H2oNa2Co3(s) + 2H(aq) + 2Cl(aq)-->2NaCl(s) +H2o(g) +Co2(g)
K2Co3(s) + 2H(aq) + 2Cl(aq)-->2KCl(s) + H2o(g) +Co2(g)D) Ho
d. How many moles of the chloride salt would be produced from one mole of original compound? _____
one mole
e. How many grams of the chloride salt would be produced from one molar mass of original compound? Molar masses:
NaHCO3 84.008 g
Na2CO3 105.99 g
NaCl 58.44 g
KHCO3 100.118 g
K2CO3 138.21 g
KCl 74.55 g
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