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3 years ago

Which statement is the best example of pseudoscience?

1 answer:

7 0

All I know is that Pseudoscience is: A collection of beliefs or practices mistakenly regarded as being based on scientific method.

Hope this helps..

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Tris is a molecule that can be used to prepare buffers for biochemical experiments. It exists in two forms: Tris (a base) and Tr

ale4655 [162]

Solution :

For the reaction :

$\text{TrisH}^+ + H_2O \rightarrow \text{Trish}^- + H_3O^+$

we have

$Ka = \frac{[\text{Tris}^- \times H_3O]}{\text{Tris}^+}$

$=\frac{x^2}{0.02 -x}$

$=8.32 \times 10^{-9}$

Clearing $x$ , we have $x = 1.29 \times 10^{-5} \text{ moles of acid}$

So to reach $\text{pH} = 7.8 (\text{pOH}= 14-7.8=6.2)$ , one must have the $\text{OH}^-$ concentration of the :

$\text{[OH}^-]=10^{-pOH} = 6.31 \times 10^{-7} \text{ moles of base}$

So we can add enough of 1 M NaOH in order to neutralize the acid that is calculated above and also adding the calculated base.

$\text {n NaOH}=1.29 \times 10^{-5}+6.31 \times 10^{-7}$

$= 1.35 \times 10^{-5} \text{ moles}$

Volume NaOH $= 1.35 \times 10^{-5} \text{ moles} \times \frac{1000 \text{ mL}}{1 \text{ mol}} = 0.0135 \text{ mL}$

Tris mass $H^+ = 0.02 \text{ mol} \times 157.6 \text{ g/mol}=3.152 \text{ g}$

Now to prepare the said solution we must mix:

$3.152 \text{ g Tris H} + 0.0135 \text{ mL NaOH} \ 1 M$ gauge to 1000 mL with water.

3 0

2 years ago

What is the correct name for the compound MgBr?

Aleonysh [2.5K]

Answer:

Magnesium bromide

Explanation:

its just the answer give brianliest

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2 years ago

Do you think the reflected waves would ever return to the airplane that transmitted them? explain

Ket [755]

No, it is very unlikely for that to happen.

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2 years ago

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Question 1 of 15<br> 2 Points<br> What is another name for a pure substance?<br> Answer here

maksim [4K]

Answer:

element

Explanation:

elements consist of pure substances

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2 years ago

Polymerization is generally also considered a(n) _______ reaction.

bazaltina [42]

Ur ans is option d
addition

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2 years ago

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