The mass of an empty evaporating dish and watch glass is 62.549 g. After the addition of an unknown, the mass was 63.089 g. The evaporating dish and unknown were heated strongly for 10 minutes. After cooling, the mass of the evaporating dish and sample were found to be 62.928 g. A sample of the unknown was also submitted to a flame test, and found to produce a violet flame. Is the unknown NaHCO3, Na2CO3, KHCO3, or K2CO3? Explain the reasoning used to arrive at your answer

Introductory Chemistry For Today
8th Edition
ISBN:9781285644561
Author:Seager
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Chapter5: Chemical Reactions
Section: Chapter Questions
Problem 5.63E
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The    mass    of    an    empty    evaporating    dish    and    watch    glass    is    62.549    g.        After    the    addition    
of     an     unknown,     the     mass     was     63.089     g.          The     evaporating     dish     and     unknown     were    
heated     strongly     for     10     minutes.          After     cooling,     the     mass     of     the     evaporating     dish     and    
sample    were     found    to    be    62.928    g.        A    sample    of    the    unknown    was    also    submitted    to    a    
flame     test,     and     found     to     produce     a     violet     flame.          Is     the     unknown     NaHCO3,     Na2CO3,    
KHCO3,    or    K2CO3?        Explain    the    reasoning    used    to    arrive    at    your    answer

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