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scoundrel [369]
3 years ago
9

How many times should you rinse a pipet before transferring liquid? 2- once with tap water and once with deionized water?

Chemistry
1 answer:
tia_tia [17]3 years ago
8 0
You need to rinse a few times with clean water to dilute and rinse out whatever was in there previously. Then rinse with the solution to be pipetted to rinse out the water and to ensure the solution sits level in the pipette.

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How many moles of nitrogen, N, are in 62.0 g of nitrous oxide, N2O?​
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Answer- the estimated number is 4 moles but it actually is 3.86 moles
Explanation
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2 years ago
An unknown diprotic acid (H2A) requires 44.391 mL of 0.111 M NaOH to completely neutralize a 0.58 g sample. Calculate the approx
Anna [14]

Answer:

M=235.42g/mol

Explanation:

Hello!

In this case, given this is an acid-base neutralization and we are considering a diprotic acid, we can write the following mole-mole relationship:

2n_{acid}=n_{base}

It means that the moles of acid can be computed given the volume and concentration of NaOH:

n_{acid}=\frac{M_{base}V_{base}}{2} =\frac{0.044391L*0.111mol/L}{2} \\\\n_{acid}=2.46x10^{-4}mol

It means that the approximate molar mass of the acid is:

M=\frac{m_{acid}}{n_{acid}} \\\\M=\frac{m_{acid}}{n_{acid}} =\frac{0.58g}{2.46x10^{-3}mol}\\\\M=235.42g/mol

Best regards!

5 0
3 years ago
How did max planck contribute to the modern atomic theory?
Igoryamba

Answer:

Planck made many contributions to theoretical physics, but his fame rests primarily on his role as originator of the quantum theory. This theory revolutionized our understanding of atomic and subatomic processes, just as Albert Einstein's theory of relativity revolutionized our understanding of space and time

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3 years ago
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I have a 4 amino acid peptide of unknown sequence with a curious titration profile around pH = 6. If Iknow that the peptide N-te
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c. Histidine

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4 years ago
Why is it necessary to use a new salt bridge for each<br> salt bridge for each electrochemical cell?
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Answer:

salt bridge balances the charge when electrons move from one half cell to another half cell.

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6 0
3 years ago
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