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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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microbiology1 microbiology1
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11 years ago
If you don;t know the right side of the equation??
for example
when Na2CrO7 and KI react in H2SO4??
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#1
11 years ago
Let UNITs guide you; always USE THEM in your calculation to prevent errors

Firstly, the eqn: Na2Cr2O7 + KI + H+ ------> IO3- + Cr+3 + K+ + Na+
_________________Cr+6____I-1__________...
(Cr<----3e's & I ----> 6e's; so 2 Cr's per I)
______________Na2Cr2O7 + KI + 8H+ -------> IO3- + 2Cr+3 + K+ +2Na+ +4H2O

Plug and SOLVE

Basic mathematics is a prerequisite to chemistry ? I just try to help you with the methodology of solving the problem.
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