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What are the properties of strong acids $?$

Answer
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Hint :The strength of an acid refers to the ease with which the acid loses a proton. A strong acid ionizes completely in an aqueous solution by losing one proton. They can also be defined by their $p{K_a}$value.

Complete Step By Step Answer:
Properties of strong acids:
$1)$Conductivity$ - $ A solution's ability to conduct electricity is conditioned by the concentration of ions it contains. A strong acid has more ions than a weak one, and so it's the solution will be a better electrical conductor than a weak acid.
$2)$Indicators$ - $ Acid-Base indicators (also known as pH indicators) are substances that change colour with $pH$. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions. ... Phenolphthalein is a colorless, weak acid that dissociates in water forming pink anions.
$3)$Physical property$ - $ Acids are sour and are water-soluble. Solutions of acids can turn blue litmus paper to red. They have $pH$ values lesser than $7$.
 Additional information:
Strong acids can catalyze chemical reactions. They are defined by their $p{K_a}$. The acid must be stronger in an aqueous solution than a hydronium ion, so its pKa must be lower than that of a hydronium ion. Therefore, strong acids have a $p{K_a}$ of $ < - 174$. Strong acids can be organic or inorganic. They are essential for catalyzing some reactions, including the synthesis and hydrolysis of carbonyl compounds.

Note :
Solid acids are additionally truly risky and responsive and should be taken care of cautiously in the lab. Assurance should always be worn who dealing with them, like gloves, veils, and wellbeing goggles.