Hydrogen is a chemical element with the symbol H and its atomic number is 1 and its electron configuration is 1s1. It is the lightest element. It is colorless, odorless, tasteless, non-toxic, and highly combustible. It is an extremely flammable gas, it burns in the air and oxygen to produce water. It is used in the synthesis of Ammonia and the manufacturing of Nitrogenous fertilizers. It is used as rocket fuel and is used in the production of hydrochloric acid.
Chromium is a chemical element with the symbol Cr. Its atomic number is 24 and its electronic configuration is [Ar]3d5 4s1. It is a steely gray, lustrous, hard, and brittle transition metal. It is not found as a free element in nature but is found in the form of ores. The main ore of chromium is Chromite.
Oxygen is a chemical element with the symbol O and the atomic number is 8. It is a colorless, odorless, tasteless gas essential to living organisms. It is a reactive element that is found in water, in most rocks and minerals, and in numerous organic compounds. It is the most abundant element in the earth’s crust. It is life-supporting gas and highly combustible.
Chromic Acid
Chromic acid is a strong oxidizing agent. It is formed when chromium trioxide reacts with water. Its chemical formula is H2CrO4. It is used to oxidize many classes of organic compounds. It is an intermediate in chromium plating. It generally refers to a collection of compounds generated by the acidification of solutions containing chromate and dichromate anions. Chromic acid forms dark purplish red crystals. Chromic acid and its salts are used in electroplating.
Structure Of Chromic Acid
Chromic Acid is a strong oxidizing agent. It is an acid so it begins with H. Next, we look at the name there is no prefix in front of the chromic acid. Acids all contain hydrogen. In this structure hydrogen bonded with chromate. The structure of chromic acid starts with four oxygen atoms bonded to chromium. Two of them have double bonds, and two have single bonds .they singly bonded oxygen atoms each have a hydrogen bonded to them.
Preparation Of Chromic Acid
- Chromium acid is formed when chromium trioxide reacts with water. The chemical equation is as follows
H2O + CrO3 ——->H2CrO4
- Chromium acid is formed when Hydrogen peroxide reacts with Chromium(III)hydroxide
3 H2O2 + 2 Cr(OH)3 ——–> 4 H2O + 2 H2CrO4
- Chromium acid is produced when Nitric acid reacts with Barium chromate
2 HNO3 + BaCrO4 —–> Ba(NO3)2 + H2CrO4
- Hydrochloric acid reacts with potassium chromate to form Chromium acid
2 HCl + K2CrO4 ——-> 2 KCl + H2CrO4
- Chromium acid is formed when sulfuric acid reacts with potassium chromate
H2SO4 + K2CrO4 ——–> K2SO4 + H2CrO4
Physical Properties Of Chromic Acid
- the molecular weight of Chromic Acid is 118.008 g/mol
- Its density is 1.201 g/cm3
- Its boiling point is 250οC
- Its melting point is 197οC
Chemical Properties Of Chromic Acid
- The chemical formula for Chromic Acid is H2CrO4
- Chromium Trioxide reacts with chromic acid to form dichromic acid
CrO3 + H2CrO4 —–> H2CrO7
- Chromic acid is react with sodium hydroxide to form sodium chromate and water
2 NaOH + H2CrO4 —–> 2 H2O + Na2CrO4
- Chromic acid is react with Silver Nitrate to form nitric acid and silver chromate
2 AgNO3 + H2CrO4 ——–> 2 HNO3 + Ag2CrO4
- Chromic acid is react with potassium hydroxide to form potassium chromate and water
2 KOH + H2CrO4 ——-> 2 H2O + K2CrO4
Uses Of Chromic Acid
- Chromic acid is used in ceramic glazes.
- It is used as a photographic chemical.
- It is used as an oxidizing agent.
- It is used as a cleaner in the laboratory.
- it is used in the metal finishing industry.
- It is used in the leather tanning, electroplating, and anticorrosive metal treatment industries.
FAQs on Chromic Acid
Question 1: Why Chromic Acid is used for cleaning?
Answer:
Chromic acid is a strong oxidizing agent. Its solution in sulfuric acid is a powerful oxidizing agent. If glassware becomes unduly clouded or dirty it must be cleaned with a chromic acid cleaning solution. It can be used to clean laboratory glassware, particularly of otherwise insoluble organic residues.
Question 2: What are the uses of chromium?
Answer:
Chromium is a chemical element with the symbol Cr. It has many uses. It is used to make molds for bricks. It is used to harden steel manufacture stainless steel and produce several alloys. It is used in metallurgy to impart corrosion resistance and a shiny finish as dyes and paints.
Question 3: Is chromic acid hexavalent?
Answer:
Chromium is a chemical element with the symbol Cr its atomic number is 24 and its electronic configuration is [Ar]3d5 4s1. It is a naturally occurring element found in rocks .plants, soil, animals, volcanic dust, and gases. Chromic acid is a strong oxidizing agent with the chemical formula H2CrO4. This chromium in an oxidation state of +6 is often referred to as hexavalent chromium.
Question 4: How corrosive is chromic acid?
Answer:
Chromic Acid is a strong oxidizing agent. It is a corrosive chemical and its contact can irritate the skin and eyes. Its solution is corrosive to metals and tissues. It is soluble in water with the release of heat.
Question 5: What happens when Chromic Acid reacts with calcium hydroxide?
Answer:
Chromic Acid is a strong oxidizing agent it reacts with calcium hydroxide to form calcium chromate and water
Ca(OH)2 + H2CrO4 ———–> 2 H2O + CaCrO4