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Ede4ka [16]
3 years ago
9

Why does the TLC tank need to be covered?

Chemistry
2 answers:
icang [17]3 years ago
7 0

Answer:

it is extremely important that the solvent in the developing chamber be lower than the spotos on the plate, because the solvent must be drawn upward through the sample in order to draw the sample along with it. ... Finally it is important to cover the chamber to be sure that the solvent does not evaporate.

Explanation:

photoshop1234 [79]3 years ago
5 0

Answer:

The reason for covering the container is to make sure that the atmosphere in the beaker is saturated with solvent vapour. Saturating the atmosphere in the beaker with vapour stops the solvent from evaporating as it rises up the paper.

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Hat volume of a 0.540 M NaOH solution contains 12.5 g NaOH
amid [387]

Answer:

At 0.58 L of 0.540 M NaOH solution contain 12.5 g NaOH.

Explanation:

Given data:

At volume = ?

Mass of NaOH = 12.5 g

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Solution:

First of all we will calculate the number of moles of sodium hydroxide.

Number of moles = mass/molar mass

Number of moles = 12.5 g / 40 g/mol

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Volume of NaOH:

Molarity = number of moles / volume in L

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5 0
3 years ago
At a given temperature, 4.06 atm of H2 and 3.5 atm of Cl2 are mixed and allowed to come to equilibrium. The equilibrium pressure
Llana [10]

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<u>Explanation:</u>

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For a general chemical reaction:

aA+bB\rightarrow cC+dD

The expression for K_p is written as:

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K_p=\frac{(p_{HCl})^2}{(p_{H_2)}(p_{Cl_2})}

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p_{HCl}=1.418atm\\p_{H_2}=4.06atm\\p_{Cl_2}=3.5atm

Putting values in above equation, we get:

K_p=\frac{(1.418)^2}{(4.06)\times (3.5)}\\\\K_p=0.1415

The value of K_p for the given chemical reaction is 0.1415

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3 years ago
What is the balanced chemical equation for caffeine?
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<span>C8H10N4O2 
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