Question

Question

IDENTIFICATION OF A COMPOUND BY MASS RELATIONSHIPS

If a student attempts to identify an unknown compound by methodused in this experiment. She finds that when she heated a sampleweighing 0.5032g the mass went down appreciably, to 0.2663 g. Whenthe product was converted to chloride, the mass went up, to 0.3747g.

a.    Is the sample a carbonate? Give yourreasoning.
b.    What are the two compounds that might be theunknown?
c.    Write the chemical equation for the overallreaction that would occur when the original compound was convertedto a chloride. If the compound is a hydrogen carbonate, use the sumof Reactions 1 and 2. If the sample is carbonate, use Reaction 2.Write the equation for a sodium salt and the for a potassiumsalt.

Reaction 1:
2 NaHCO3 (s) -> Na2CO3 (s) + H2O (l) + CO2(g)

Reaction 2:
Na2CO3 (s) + 2 H+ (aq)+ 2 Cl- (aq) -> 2 NaCl (s) + H2O (l) +CO2 (g)

d.    How many moles of the chloride salt would beproduce from one mole of the original compound?
e.    How many grams of the chloride salt would beproduced from one molar mass of the original compound?

Molar masses: NaHCO3 _______g   Na2CO3_______g    NaCl_______g         
           KHCO3 _______g   K2CO3 _______g    KCl_______g

        If a sodium salt, _______goriginal compound -> _______g chloride
If a potassium salt, _______g original compound -> _______gchloride

f.    What is the theoretical value of Q,

If she has an Na salt? _______ if she has a K salt? _______

g.    What was the observe value of Q?
h.    Which compound did she have an unknown?


Question IDENTIFICATION OF A COMPOUND BY MASS RELATIONSHIPS

If a student attempts to identify an unknown compound by methodused in this experiment. She finds that when she heated a sampleweighing 0.5032g the mass went down appreciably, to 0.2663 g. Whenthe product was converted to chloride, the mass went up, to 0.3747g.

a.    Is the sample a carbonate? Give yourreasoning.
b.    What are the two compounds that might be theunknown?
c.    Write the chemical equation for the overallreaction that would occur when the original compound was convertedto a chloride. If the compound is a hydrogen carbonate, use the sumof Reactions 1 and 2. If the sample is carbonate, use Reaction 2.Write the equation for a sodium salt and the for a potassiumsalt.

Reaction 1:
2 NaHCO3 (s) -> Na2CO3 (s) + H2O (l) + CO2(g)

Reaction 2:
Na2CO3 (s) + 2 H+ (aq)+ 2 Cl- (aq) -> 2 NaCl (s) + H2O (l) +CO2 (g)

d.    How many moles of the chloride salt would beproduce from one mole of the original compound?
e.    How many grams of the chloride salt would beproduced from one molar mass of the original compound?

Molar masses: NaHCO3 _______g   Na2CO3_______g    NaCl_______g         
           KHCO3 _______g   K2CO3 _______g    KCl_______g

        If a sodium salt, _______goriginal compound -> _______g chloride
If a potassium salt, _______g original compound -> _______gchloride

f.    What is the theoretical value of Q,

If she has an Na salt? _______ if she has a K salt? _______

g.    What was the observe value of Q?
h.    Which compound did she have an unknown?


IDENTIFICATION OF A COMPOUND BY MASS RELATIONSHIPS

If a student attempts to identify an unknown compound by methodused in this experiment. She finds that when she heated a sampleweighing 0.5032g the mass went down appreciably, to 0.2663 g. Whenthe product was converted to chloride, the mass went up, to 0.3747g.

a.    Is the sample a carbonate? Give yourreasoning.
b.    What are the two compounds that might be theunknown?
c.    Write the chemical equation for the overallreaction that would occur when the original compound was convertedto a chloride. If the compound is a hydrogen carbonate, use the sumof Reactions 1 and 2. If the sample is carbonate, use Reaction 2.Write the equation for a sodium salt and the for a potassiumsalt.

Reaction 1:
2 NaHCO3 (s) -> Na2CO3 (s) + H2O (l) + CO2(g)

Reaction 2:
Na2CO3 (s) + 2 H+ (aq)+ 2 Cl- (aq) -> 2 NaCl (s) + H2O (l) +CO2 (g)

d.    How many moles of the chloride salt would beproduce from one mole of the original compound?
e.    How many grams of the chloride salt would beproduced from one molar mass of the original compound?

Molar masses: NaHCO3 _______g   Na2CO3_______g    NaCl_______g         
           KHCO3 _______g   K2CO3 _______g    KCl_______g

        If a sodium salt, _______goriginal compound -> _______g chloride
If a potassium salt, _______g original compound -> _______gchloride

f.    What is the theoretical value of Q,

If she has an Na salt? _______ if she has a K salt? _______

g.    What was the observe value of Q?
h.    Which compound did she have an unknown?


Anonymousanswered this more than 1 day later Answer question Anonymousanswered this more than 1 day later Answer question Answer question

Explanation / Answer

Answer question

Related Questions

Navigate

• Browse (All)
• Browse Q
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.