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Mashcka [7]
3 years ago
13

What is the element of 1s^22s^2p^63s^23p^64s^23d^104p^65s^24d^105p^1

Chemistry
1 answer:
77julia77 [94]3 years ago
7 0
The answer is Indium
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How many milliliters of ammonium sulfate solution having a concentration of 0.218 M are needed to react completely with 62.6 ml
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Answer:

330 mL of (NH₄)₂SO₄ are needed

Explanation:

First of all, we determine the reaction:

(NH₄)₂SO₄  +  2NaOH →  2NH₃  +  2H₂O  +  Na₂SO₄

We determine the moles of base:

(First, we convert the volume from mL to L) → 62.6 mL . 1L/1000 mL = 0.0626L

Molarity . volume (L) = 2.31 mol/L . 0.0626 L = 0.144 moles

Ratio is 2:1. Therefore we make a rule of three:

2 moles of hydroxide react with 1 mol of sulfate

Then, 0.144 moles of NaOH must react with (0.144 .1) /2 = 0.072 moles

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We convert from L to mL → 0.330L . 1000 mL/1L = 330 mL

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Calculate the hydroxide ion consentration of a solution with pH = 3.25. show all calculations leading to your answer.
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First you calculate the pOH of the solution:

pH+ pOH = 14

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pOH = 10.75

<span>Concentration of [OH]</span>⁻<span> in solution:
</span>
[ OH⁻ ] = 10 ^{-pOH}

[ OH⁻ ]  = 10^ - 10.75

[OH⁻] = 1.778 x 10⁻¹¹ M

hope this helps !


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