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Fill in the blanks:
i. ____________ taste is a characteristic property of all acids in aqueous solution.
ii. Acids react with some metals to produce _____________ gas.
iii. Because aqueous acid solutions conduct electricity, they are identified as ________
iv. Acids react with bases to produce a ________ and water.
v. Acids turn ____________ different colours.

Last updated date: 25th Feb 2024
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IVSAT 2024
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Hint:These are all characteristics of acids. To guess the taste, we can think of the taste of dilute acid solutions present naturally, like lime water. The basic property of acids is that they contain hydrogen and this can react with metals. For the third part, the answer is the common name used for aqueous solutions which conduct electricity. The fourth part is the well-known neutralization reaction, and the last part is the reaction of acids with indicators.

Complete answer:
For the first part, we can think of the naturally occurring lime water, which contains citric acid. As we know, lime water tastes sour, and in fact, so do all aqueous solutions of acids.
We know that all acids contain hydrogen, and their ability to release hydrogen ions is what makes them acids. When metals react with acids, the metal displaces the hydrogen from the acid and liberates it as a gas. For example:
${H_2}S{O_4} + Zn \to ZnS{O_4} + {H_2} \uparrow$
Liquid/molten/aqueous solutions which conduct electricity are known as electrolytes. As acid solutions conduct electricity due to the presence of ions, they are also electrolytes.
Acids react with bases to form a salt and water, and this reaction is known as the neutralization reaction. For example,
$HCl + NaOH \to NaCl + {H_2}O$
Acids can be identified in many ways, and using indicators is one of the most common, as all acids turn indicators into different colours. For example, acids turn blue litmus solution red, turn violet coloured phenolphthalein into colourless, turn methyl orange into red etc.
Therefore, the answers to all the blanks are:
i. Sour
ii. hydrogen
iii. electrolytes
iv. salt
v. indicators

In aqueous solution (when mixed with water) acids release their constituent ions, and this is the reason why they conduct electricity, as the ions possess charge and are free to move around. One of these ions will surely be the hydrogen ion (${H^ + }$) and thus, acids have a low value on the $pH$ scale, which measures the concentrations of ${H^ + }$ ions in the solution. As a result, acids turn $pH$ papers, also known as the universal indicators, into red, orange or yellow depending upon the strength of the acid.
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