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Helga [31]
2 years ago
6

Me and my sister needs help on this question PLEASE HELP! (Look at photo)

Chemistry
2 answers:
zloy xaker [14]2 years ago
7 0
It’s B because the plate that’s more dense is always on the bottom.
irakobra [83]2 years ago
5 0
B it’s the second one
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Goryan [66]

Answer:

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3 0
3 years ago
If you start with 0.30 m mn2 , at what ph will the free mn2 concentration be equal to 4.6 x 10-11 m?
aksik [14]

If you start with 0.30 m Mn₂ , at 12.5 pH, free Mn₂ concentration be equal to 4.6 x 10⁻¹¹ m

Initial molarity of Mn₂ = 0.30 M

Final molarity of Mn₂ = 4.6 x 10⁻¹¹

pH = ?

Ksp [Mn(OH)₂] = 4.6 x 10⁻¹⁴ (standard value)

Write the ionic equation

    Mn(OH)₂   →    Mn⁺² + 2OH⁻

    [Mn⁺²] = 4.6 x 10⁻¹¹

We will calculate the concentration of OH⁻ by using Ksp expression

    Ksp = [Mn⁺²][OH-]²

    [Mn⁺²][OH⁻]² = 4.6 x 10⁻¹⁴

    [OH⁻]² = 4.6 x 10⁻¹⁴ / 4.6 x 10⁻¹¹

    [OH⁻]² = 10⁻³

    [OH⁻] = (10⁻³)¹⁽²

    [OH⁻] = 0.0316 M

Calculate the pOH

    pOH = -log [OH⁻]

    pOH =  -log [0.0316]

    pOH = 1.5

Now calculate pH

   pH = 14 - pOH

   pH = 14 - 1.5

   pH = 12.5

You can also learn about molarity from the following question:

brainly.com/question/14782315

#SPJ4

7 0
1 year ago
What is number 1 for b, c, and d?
SVETLANKA909090 [29]
B because....................
4 0
3 years ago
PLEASE HELP!!! 10 POINTS
k0ka [10]

i think the answer is C

3 0
3 years ago
Why do the leaves outside change colors?
Allushta [10]

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because the amount of pigments change as thee leaves prepare to fall from the trees

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3 years ago
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