3 years ago

Which evidence is an indication that a chemical reaction has occurred?

1 answer:

6 0

A. Formation of a gas. You can tell a chemical reaction has occurred through: formation of a precipitate, formation of a gas (also known as bubbles) unexpected color change, unexpected odor change, temperature change.

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Write the balanced equation. Then calculate the volume of 0.65 M HCl required to completely neutralize 400.0 ml of 0.88 M KOH.

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Hello!

The balanced equation for the neutralization of KOH is the following:

HCl(aq) + KOH(aq) → KCl(aq) + H₂O(l)

To calculate the volume of HCl required, we can apply the following equation:

$moles HCl = moles KOH \\ \\ cHCl*vHCl=cKOH*vKOH \\ \\ vHCl= \frac{cKOH*vKOH}{cHCl}= \frac{400 mL*0,88M}{0,65M}= 541,54mL$

So, the required volume of HCl is 541,54 mL

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Question 20 of 25

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