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2 years ago

What two properties (one chemical and one physical) combine to make bromcresol green useful as an acidity indicator?

Chemistry

1 answer:

Brilliant_brown [7]2 years ago

6 0

Two properties are :

Bromcresol green is useful as an acidity indicator because it changes to yellow as the pH becomes more acidic

Also, the bromcresol green protons are easily dissociated making the color change visible and relatively quick.

Why is bromocresol green used as an indicator?

Bromocresol green (BCG) is a dye of the triphenyl methane family (triarylmethane dyes). It belongs to a class of dyes called sulfonephthaleins. It is used as a pH indicator in applications such as growth mediums for microorganisms and titrations.

How does a pH indicator work?

pH indicators detect the presence of H+ and OH-. They do this by reacting with H+ and OH-: they are themselves weak acids and bases. If an indicator is a weak acid and is colored and its conjugate base has a different color, deprotonation causes a color change.

What is chemical change and physical change?

Physical changes are reversible and do not produce a new substance. Chemical changes result in the production of a new substance and cannot be reversed.

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5. In a general chemistry laboratory experiment, a student produces 2.73 g of a compound. She calculates the

OLEGan [10]

The percent yield is given by the actual and the theoretical yield. The percent yield of the 2.73 gm compound is 80.3%. Thus, option b is correct.

<h3>What is the percent yield?</h3>

The percent yield is the ratio of the actual yield to the theoretical yield. It is calculated as:

% Yield = Actual yield ÷ Theoretical yield × 100%

= 2.73 ÷ 3.84 × 100%

= 71.09 %

As the closest number to 71.09 is 80.3% the percent yield will be 80.3%.

There is no limiting reagent in the reaction between the copper iodide and mercury iodide as the moles of the reactants and the products are in equal quantity.

Hence, option b. there is no limiting reagent in this reaction.

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8 0

2 years ago

What’s the difference between directly<br> proportional and inversely proportional.

tatiyna

Answer:

Directly proportional:

A proportion of two variable quantities. when the ratio of two quantities are constant.

inversely proportional:

when one value decreases at the same rate that the other increases.

Explanation:

I hope this does help you, have a great day. :)

7 0

3 years ago

To construct the galvanic cell illustrated above, the salt bridge was prepared by soaking a piece of cotton in 5.0MNaNO3(aq) bef

dalvyx [7]

Answer:

The cell reaction reaches equilibrium quickly and the cell emf becomes zero.

Explanation:

The purpose of a salt bridge is not to move electrons from the electrolyte, its main function is to maintain charge balance because the electrons are moving from one-half cell to the other.

A solution of a salt that dissociates easily is normally used. Water is ineffective at functioning as a salt bridge. Hence the effect stated in the answer.

4 0

4 years ago

The normal range of the pH of blood is between 7.35 and 7.45; variations beyond this range have significant health implications.

patriot [66]

Answer:

The hydrogen ion concentrations associated with these pH value 7.35 is $4.5\times 10^{-8} M$