Substances which have a pH level of less than 7 are acidic, whereas the solutions with a pH value higher than 7 are alkalis or are basic. Water has a pH level of 7, which is neutral. Hence water is neither acidic, nor is it a base.
SPL Sorensen was the first scientist to use the pH scale. From 1901 to 1938, SPL Sorensen headed the Carlsberg Laboratory in Denmark's capital, Copenhagen. Over there, he studied the effects of the ion concentration on proteins. Since studying the concentration of the hydrogen ion was especially important, Sorensen thought of simply developing a scale as a way to measure the ions. He did so in the year 1909.
To mark and celebrate SPL Sorensen's introduction of the pH scale, Google has created an interactive Doodle, which aims to explain the pH scale to beginners by making the user guess which items have which pH level.
SPL Sorensen was born in the Danish city of Havrebjerb on 9th January, 1868. He died on 12th February in 1939.
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