Ammonia dissolves in water to form an alkaline solution, and produces ammonium salts that are important as fertilisers
pH
The pH scale is a measure of the acidity or alkalinity of a solution
It is a logarithmic scale with pH 7 denoting a neutral solution and with most solutions having a pH between 0 & 14
The Arrhenius theory states that acids dissociate when dissolved in water and increase the concentration of Hydrogen ions, H+(aq), in solution, whilst alkalis increase the concentration of Hydroxide ions, OH-(aq)1
Universal indicator is a solution of several compounds that exhibits several smooth colour changes over the pH scale that correlates with the visible spectrum, with green denoting pH 7
The more accepted Brønsted-Lowry theory states that in an acid-base equation, the acid donate a Hydrogen ion to form its conjugate base, whilst the base accepts a Hydrogen ion to form its conjugate acid ↩