They are classified on the basis of their sources, strength, concentration, the presence of oxygen and its basicity.Acids and metal sulphides form salt and hydrogen sulphide.Acids form a salt, water and sulphur dioxide while reacting with sulphites and bisulphites.Metals that generally react with dilute acid to form salt and hydrogen are the metals which lie above hydrogen in the metal activity series.Nitric Acids doesn’t usually exhibit acidic properties, it exhibits oxidizing properties instead.Weak Acids like Carbonic Acid doesn’t act with any metal at all.Extremely active metals such as Potassium (K), Calcium (Ca), Sodium (Na), etc tend to explode when combined with acids.Acids react with carbonates and hydrogen carbonates to form a salt, water, and carbon dioxide gas.When equal amounts of acid and base are combined the process of neutralization occurs and salt and water is formed,.Acids lose their acidity when mixed with a base. They produce H+ ions when mixed with water.Acids tend to evolve hydrogen gas whilst reacting with an active metal such as Zn, Mg, etc.Some Acids are highly corrosive in nature which means that they corrode or rust metals.Acids turn the pink colour of Phenolphthalein to colourless.They convert the colour of Methyl Orange from Orange/Yellow to Pink.Acids change the colour of litmus from blue to red.Now we explore the chemical properties of acids and bases.
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