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Often asked: Pka of bromothymol blue literature value?

What is the pKa of bromophenol blue?

Acid-Base Indicators

Indicator pH Range pKa
Methyl yellow 2.9 to 4.0 3.3
Methyl orange 3.1 to 4.4 3.4
Bromophenol blue 3.0 to 4.6 3.85
Bromocresol green 4.0 to 5.6 4.7

What is the pH range for Bromothymol blue?

Indicator Range

Indicator Colour pH range
Bromocresol Green yellow 3.8 – 5.4
Methyl Red yellow 4.8 – 6.0
Bromothymol Blue yellow 6.0 – 7.6
Phenol Red yellow 6.8 – 8.4

What does the pKa value represent?

The pKa value is one method used to indicate the strength of an acid. pKa is the negative log of the acid dissociation constant or Ka value. A lower pKa value indicates a stronger acid. That is, the lower value indicates the acid more fully dissociates in water.

What is the acidic form of Bromothymol blue?

Bromthymol Blue is a dye used as an indicator in determining pH. Bromthymol blue is a weak acid. It can be in acid or base form, depending on the pH of the solution. This reagent is yellow in acidic solutions, blue in basic solutions and green in neutral solution.

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How do I calculate pKa?

Similar to pH, the value of Ka can also be represented as pKa. pKa = -log Ka. The larger the pKa, the weaker the acid. pKa is a constant for each conjugate acid and its conjugate base pair.

Why do we use bromophenol blue?

It is often used as a tracking dye during agarose or polyacrylamide gel electrophoresis. Bromophenol blue has a slight negative charge and will migrate the same direction as DNA, allowing the user to monitor the progress of molecules moving through the gel. The rate of migration varies with gel composition.

What happens if you drink Bromothymol blue?

Ingestion: May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. Inhalation: May cause respiratory tract irritation. May be harmful if inhaled.

How accurate is Bromothymol blue?

This 0.1% aqueous bromothymol blue solution (also known as Bromthymol Blue) is a commonly used pH indicator. Bromthymol blue changes color over a pH range from 6.0 (yellow) to 7.6 (blue). It is a good indicator of dissolved carbon dioxide (CO2) and other weakly acidic solutions.

What caused the color change in Bromothymol blue?

What caused the bromothymol blue solution to change color? The bromothymol blue solution changed color because there was a chemical reaction with the carbon dioxide. This is because the carbon dioxide was expelled into it faster, because of the exercising.

What does a pKa of 7 mean?

3<pKa<7 is for a weak acid. 7<pKa<11 is for a weak base. pKa>11 is for a strong base.

What is a high pKa value?

The higher the pKa of a Bronsted acid, the more tightly the proton is held, and the less easily the proton is given up. The pKa scale as an index of proton availability. Low pKa means a proton is not held tightly. pKa can sometimes be so low that it is a negative number! High pKa means a proton is held tightly.

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What does a high pKa value mean?

A larger pKa for the conjugate acid indicates a stronger base. For indicating base strength directly we use pKb, in which case a smaller value is more basic.

Why is Bromothymol blue green in neutral solutions?

It is bright aquamarine by itself, and greenish-blue in a neutral solution. The deprotonation of the neutral form results in a highly conjugated structure, accounting for the difference in color. An intermediate of the deprotonation mechanism is responsible for the greenish color in neutral solution.

What does it mean when Bromothymol blue turns green?

Bromothymol blue (BMB) is an indicator dye that turns yellow in the presence of acid. When carbon dioxide is added to the solution, it creates carbonic acid, lowering the pH of the solution. BMB is blue when the pH is greater than 7.6, green when the pH is between 6-7.6, and yellow when the pH is less than 6.

Is bleach an acid or a base?

Chlorine bleach is extremely basic, as it has a high pH of 13. This means that a chlorine bleach solution has a H+ concentration of about one-millionth of the H+ concentration in pure water.

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