Talking about some questions about Chromic acid

Q1:Is there something different between potassium dichromate and chromic acid ？

Yes , they are not the same. Chromic acid can be either H2CrO4 or H2Cr2O7 or a mixture of the two. The key thing is that chromium must be in the +6 oxidation state. Chromic acid can be prepared by acidifying your potassium dichromate with sulfuric acid. This makes a good but toxic glassware cleaner. It works by oxidizing the stuff stuck to the glassware and is reduced to [Cr(H2O)6]3+ in the process. 

The problem is that chromium is an environmental toxin and the use of chromic acid(CAS NO:7738-94-5)to clean glassware has dropped off to nil. How about buying some Alconox. It's much safer and works almost as well. 

Q2:What are the dangers of chromic acid?

Chromic acid(CAS NO:7738-94-5), soln. of Chrom (VI) Oxide, CrO3 is probably the most common salt of Cr6+.  Contrary to Cr3+ which is needed by our body (in small quantity), Cr6+ is very toxic. IN long term is is a confirmed carcinogenic and mutagenic. It also cause sensitizations on some individuals. 

Spilling it on skin is bad, but I'm more concern about breathing the materail. The dust of Cr6+ is extremely corrosive to you lung tissue, causing severe irritation to mucose and upper respiratory tract. Worse, if it travels down to bronchea and ultimately alveoli, especially on going on basis, it may lead to a lung cancer and similar symptoms. 

Q3:Is there a difference between hydrogen chromate and chromic acid?

The prefixes and suffixes describe the formula of the acid. For the acid containing the most common polyatomic ion of its group simply use the first part of the polyatomic name and follow with the suffix ic. Ex. H2 SO4 Sulfuric acid  Chromate, CrO4 -2, is the most common ion of chromium and oxygen.  So H2CrO4 is chromic acid. Hydrogen chromate is the name of a compound, which contains hydrogen and the chromate ion. 
H = +1                            CrO2 = -2 
H2CrO4 is the chemical formula of Hydrogen chromate 
Chromic acid and Hydrogen chromate are 2 names for the same compound. 
Hydrogen Phosphate = H+1 + PO4 -3 = H3PO4 
Phosphoric acid = H3PO4  The same is true for H3PO4 

Q4:How much chromic acid would react with 1g ethanol if the yield is quantitative?

Figure out how many moles of ethanol you have. Then since chromic acid reacts 2 to 1 with the ethanol you know you have 2 times that many moles chromic acid. Figure out the formula weight of chromic acid, then multiply by the moles of chromic acid you have. Lets assume the formula weight for ethanol is 46 grams per mole, then since you only have 1 gram, that 1/46th of a mole.

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