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3 years ago

What are two functions of the cell membrane?

Chemistry

1 answer:

VMariaS [17]3 years ago

8 0

I know one I think, the nucleus

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WARRIOR [948]

Answer:

for the how to get a carrot to float you would need to make a hole in it and make it hollow

Explanation:

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3 years ago

What is the pH of a 1.0 L buffer made with 0.300 mol of HF (Ka = 6.8 × 10⁻⁴) and 0.200 mol of NaF to which 0.150 mol of HCl were

irinina [24]

Answer:

pH = 2.21

Explanation:

Hello there!

In this case, according to the reaction between NaF and HCl as the latter is added to the buffer:

$NaF+HCl\rightarrow NaCl+HF$

It is possible for us to see how more HF is formed as HCl is added and therefore, the capacity of this HF/NaF-buffer is diminished as it turns acid. Therefore, it turns out feasible for us to calculate the consumed moles of NaF and the produced moles of HF due to the change in moles induced by HCl:

$n_{HF}^{new}=0.300mol+0.150mol=0.450mol\\\\n_{NaF}^{new}=0.200mol-0.150mol=0.050mol$

Next, we calculate the resulting concentrations to further apply the Henderson-Hasselbach equation:

$[HF]=\frac{0.450mol}{1.0L} =0.450M$

$[NaF]=\frac{0.050mol}{1.0L} =0.050M$

Now, calculated the pKa of HF:

$pKa=-log(6.8x10^{-4})=3.17$

We can proceed to the HH equation:

$pH=pKa+log(\frac{[NaF]}{[HF]} )\\\\pH=3.17+log(\frac{0.05M}{0.45M} )\\\\pH=2.21$

Best regards!

6 0

3 years ago

2Fe2O3+3C_4Fe+3 CO2 how many moles of Carbon are needed to produce 1.9 moles of iron (Fe)?

Bad White [126]

Um use English no offense

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3 years ago

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harina [27]

Answer:

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3 years ago

What is the term used for the specific type of electron which is considered "free" and which aid in the formation of metallic bo

asambeis [7]

Valence electron, hope that helps

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3 years ago