1) Acid solutions have a sour taste., 2) Not all acids can be tasted; some of them are poisonous., 3) Not all acids contain hydrogen atoms., 4) Alkalis are caustic substances that corrode many organic substances; special care must be taken when working with them., 5) Alkali solutions are sticky to the touch., 6) Indicators are substances that do not change their color when exposed to solutions of acids and alkalis., 7) The interaction of acids with alkalis - neutralization reaction., 8) Aluminum + hydrochloric acid = aluminum chloride + hydrogen., 9) Gold + hydrochloric acid = gold chloride + hydrogen., 10) Calcium carbonate + hydrochloric acid = calcium chloride + water + carbon dioxide.,

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