What happens when acid is dissolved in water?
It releases H+ ions.
By the Arrhenius definition, an acid is a substance that produces hydrogen ions (H+) when dissolved in water. For example, HCl dissociates as HCl → H+ + Cl−.
These H+ ions actually combine with water to form hydronium ions (H3O+), and it is the presence of these ions that gives an acidic solution its sour taste, its ability to turn blue litmus red and its low pH. Hence dissolving an acid in water releases H+ ions.
Releasing OH− ions is the property of a base, not an acid. An acid forms a salt only when it reacts with a base (neutralisation), not merely on dissolving in water. Dissolving an acid in water actually allows it to ionise and show its acidic nature, so it does not lose its acidic properties.
The molecular mass of carbon dioxide is:
A sample of brass is melted and poured into a mold to make a musical instrument. Which of the following correctly explains why brass is classified as a homogeneous mixture?
Which of the following statements are correct in relation to the extraction of metals? The metals which lie high in the reactivity series are extracted by the electrolysis of molten ore.
The metals of medium reactivity series exist as sulphides and carbonates in nature. It is easier to extract a metal from its sulphide in comparison to oxides.
Which of the following statements best explains why dry HCl gas does NOT change the colour of dry litmus paper, but aqueous HCl does?
Which of the following is NOT a property associated with compounds?
What is the purpose of enrichment of ore before extraction?
Which statement best describes an olfactory indicator?
In electrolytic refining, the impure metal is used as which of the following?
Which of the following 'indicators' is used to test the nature of solutions besides litmus paper?
Which of the following given below is an alloy of mercury?
The chemical symbol of potassium is _______.
In a molecule of water, the ratio of the mass of hydrogen to that of oxygen is:
Which is the element having the highest atomic mass among the following?
Each water molecule, contains _______ hydrogen atoms and one Oxygen atom.