Which indicator is yellow in a solution with a pH of 9.8?

2 answers:

8 0

It's the Methyl Orange.
at about 4.4 pH, it changes from red to Yellow, to indicate an acid solution.
This pH indicator is normally used in titration of acids.

Hope this Helps :)

Mama L [17]3 years ago

6 0

Answer:

1) Methyl orange

Explanation:

Acid base indicators are solutions of certain dyes that bring about a color change at a certain pH i.e. the at a particular H+ ion concentration.

The color change and the pH range for the four indicators mentioned in the question are as follows:

indicator pH range color change

1. Methyl orange 3.2-4.4 red-yellow

2. Bromothymol blue 6.0-7.6 yellow-blue

3. Bromocresol green 3.8-5.4 yellow-green

4. Thymol blue 8.0-9.6 yellow-blue

Based on the above data, only methyl orange is yellow at pH above 4.4. Hence, indicator is yellow in a solution with a pH of 9.8 is methyl orange

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Calculate the molality of a solution that contains 51.2 g of naphthalene, C10H8, in 500 mL of carbon tetrachloride. The density

PtichkaEL [24]

Answer: The molality of naphthalene solution is 0.499 m

Explanation:

Density is defined as the ratio of mass and volume of a substance.

$\text{Density}=\frac{\text{Mass}}{\text{Volume}}$ ......(1)

Given values:

Volume of carbon tetrachloride = 500 mL

Density of carbon tetrachloride = 1.60 g/mL

Putting values in equation 1, we get:

$\text{Mass of carbon tetrachloride}=(1.60g/mL\times 500mL)=800g$

Molality is defined as the amount of solute expressed in the number of moles present per kilogram of solvent. The units of molarity are mol/kg. The formula used to calculate molarity:

$\text{Molality of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Mass of solvent (in g)}}$ .....(2)