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Acid has a ph value below 7 
and alkali has a value above 7 
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Acids are sour to taste. they turn red litmus to blue litmus. they contain h3o+ ions.
Ex : hcl, ch3cooh
alkalis are soapy to touch. they turn blue litmus to red. they contaion oh- ions.
Ex: naoh

Hope dis helps u.... :)
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