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aalyn [17]
3 years ago
14

4) Which indicator, when added to a solution, changes color from yellow to blue as the pH of the

Chemistry
1 answer:
Arte-miy333 [17]3 years ago
7 0

Answer:

c) bromthymol blue

Explanation:

An acidic solution has a pH value less than 7, while the pH is 7 for a neutral solution and grater than 7 for a basic solution.

Bromothymol blue is a pH indicator which is yellow in color when placed in an acid (pH under 7), the color is green in a neutral solution (pH of 7) and blue in an basic solution (pH over 7).

If bromthymol blue is added to a solution with an initial pH of 5.5 (acidic), the color would be yellow and as the pH changes to 8 (basic), the color changes to blue.

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<u>Given:</u>

Mass of pure iron (Fe) = 3.4 g

<u>To determine:</u>

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<u>Explanation:</u>

Reaction between HBr and Fe is

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Based on the reaction stoichiometry-

1 mole of Fe reacts with 2 moles of HBr

# moles of Fe = mass of Fe/atomic mass of Fe = 3.4/56 g.mol⁻¹ = 0.0607 moles

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