True: A strong alkali will have a pH value of 12-14 , An acid can neutralise an alkali, The formula of sodium hydroxide is NaOH, Toothpaste is a weak alkali, False: Acids have pH numbers higher than 7, Lemon juice is a weak alkali, A neutral solution has a pH value of 1, The formula of hydrochloric acid is H2SO4,

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