Transition metals can have numerous valency or oxidation numbers.
The most common oxidation states of chromium are Cr2+, Cr3+ and the hexavalent Cr6+.
Chromium in potassium dichromate is hexavalent.
Oxidation states: K+ → (+1) x 2 = +2
O2- → (-2) x 7 = -14
Crx → (X) x 2 = 2X
Overall oxidation state: (+2) + 2X + (-14) = 0
2X = 14-2
X = +6
The US Environmental Protection Agency (EPA) places limits on the quantities of toxic substances that may be discharged into the sewer system. Limits have been established for a variety of substances, including hexavalent chromium, which is limited to 0.50 mg/L. If an industry is discharging hexavalent chromium as potassium dichromate (K2Cr2O7), what is the maximum permissible molarity of that substance?
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