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2 years ago

What color would a bromocresol green solution be at ph=7 ?

1 answer:

8 0

Bromocresol Green belongs to a class of dyes called as Sulfonephthaleins. This dye imparts different colours at different pH's.

Colors at different pH:
 Bromocresol Green has a transition pH range between 3.8 and 5.4.

Color Below pH 3.8:
Bromocresol Green imparts Yellow color below pH 3.8.

Color Above pH 5.4:
Bromocresol Green imparts Blue color above pH 5.4.

Due to different colors at different pH this compound is used at Indicator in quantitative analysis techniques like Titration.

Result:
Bromocresol Green will give Blue color at pH 7.

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A 2.4 L balloon holds 3.7 mol He. If 1.6 mol He are added to the balloon, what is the new volume?

Elanso [62]

For this question, lets apply Avagadro's law
when Pressure and temperature are constant, the volume occupied is directly proportional to the number of moles of gases.
$\frac{V}{n} = k$
where V-volume, n-number of moles and k - constant
Therefore at 2 instances
$\frac{V1}{n1} = \frac{V2}{n2}$
where V1 and n1 are for 1st instance
and V2 and n2 are for 2nd instance
therefore
$\frac{V1}{n1} = \frac{V2}{n2}$
V1 = 2.4 L
n1 = 3.7 mol
n2 = 3.7 + 1.6 = 5.3 mol
since more He moles are added at the 2nd instance its the sum of the moles.
V2 needs to be calculated $\frac{2.4}{3.7} = \frac{V2}{5.3}$
V2 = 2.4 x 5.3 / 3.7
= 3.4 L
Answer is 1st option 3.4 L

6 0

2 years ago

How many moles are in 24.75 g of H2O? What is given the conversation and the unknown?

riadik2000 [5.3K]

Answer:

1.373 mol H₂O

General Formulas and Concepts:

Chemistry - Atomic Structure

Reading a Periodic Table
Using Dimensional Analysis

Explanation:

Step 1: Define

24.75 g H₂O

Step 2: Identify Conversions

Molar Mass of H - 1.01 g/mol

Molar Mass of O - 16.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Convert

$24.75 \ g \ H_2O(\frac{1 \ mol \ H_2O}{18.02 \ g \ H_2O} )$ = 1.37347 mol H₂O

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

1.37347 mol H₂O ≈ 1.373 mol H₂O

7 0

2 years ago

Number of Hydrogen Atoms in C18H34O2?

solniwko [45]

There are 34 hydrogen atoms.

6 0

3 years ago

Read 2 more answers

La etiqueta de una bebida transparente con un ligero toque anaranjado indica que contiene aga con un 15 porciento de zumo de nar

Brilliant_brown [7]

Respuesta:

16 gramos de vitamina C y 8 gramos de colorantes.

Explanation:

Debemos multiplicar el porcentaje de cada componente por la cantidad total (100 %) de zumo.

800 g de zumo = 100%

- Tenemos un 2 porciento (2 en 100 o 2/100) de vitamina C. Por lo tanto, la cantidad en gramos de vitamina C es:

2/100 x 800 g = 16 g

- Tenemos un 1 porciento de colorantes en el zumo (1/100). Por lo tanto, la cantidad en gramos de colorantes es:

1/100 x 800 g = 8 g

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2 years ago

A 70.0-g piece of copper metal at 86.0 ∘c is placed in 50.0 g of water at 16.0 ∘c. The metal and water come to the same temperat

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Copper is current voltage above 40 or 200 . copper useful for motor and some medicine

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2 years ago