# Sour taste of lemon

Chemistry Level pending

In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Which of the following explanations is correct?

a) The pH of distilled water is zero.

b) The higher the concentration of hydrogen ion, the higher the value of pH.

c) The pH of a hydrochloric acid solution is higher than that of the aqueous solution of sodium hydroxide.

d) The concentration of hydrogen ions in a solution with pH $$4$$ is $$10$$ times higher than that of a solution with pH $$5$$.

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