Answer:
The easiest way to test if water is acidic is to use litmus paper. Litmus paper is a paper that contains special dyes that will change color when exposed to acids or bases. In your case, if you dip blue litmus paper into water samples and it turns pink or red, then the water is acidic.
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Julia, Ernesto y Pablo are waiting for it (the bus).) is a correct statement.
<h3>What is the statement about?</h3>
The statement Julia, Ernesto y Pablo están esperándolo is a response to a previously given question which is Julia, Ernesto and Pablo are waiting for him in English.
Julia, Ernesto y Pablo are waiting for it the bus is also known to be the response to the first question and as such the tenses are correct.
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