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erma4kov [3.2K]
3 years ago
7

If you had a 0.550 L solution containing 0.0250 M of Cr3+(aq), and you wished to add enough 1.27 M NaOH(aq) to precipitate all o

f the metal, what is the minimum amount of the NaOH(aq) solution you would need to add? Assume that the NaOH(aq) solution is the only source of OH−(aq) for the precipitation.
Chemistry
1 answer:
ololo11 [35]3 years ago
6 0

Answer:

0.032 L of NaOH

Explanation:

The reaction is;

Cr^3+(aq) + 3OH^- (aq) -----> Cr(OH)3(s)

Amount of Cr^3+ = 0.550 × 0.0250 = 0.01375 moles

If 1 mole of Cr^3+ reacts with 3 moles of OH^-

0.01375 moles of Cr^3+ reacts with 0.01375 moles × 3/1

= 0.04125 moles of OH^-

Hence we need 0.04125 moles/1.27 M = 0.032 L of NaOH

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Answer:

8

Explanation:

From the question given above, the following data were obtained:

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Number of valence electron =?

The valence electron(s) talks about the combining power of an element or compound as the case may be.

Considering the t–butyl ion, (CH₃)₃C⁺ we can see that it has a charge of +1 indicating that it has given out 1 electron to attain the stable octet configuration which has a valence electrons of 8. Thus, the valence electron of t–butyl ion, (CH₃)₃C⁺ is 8

5 0
3 years ago
21 mL It required 42.35 mL of H2SO4 to neutralize 21.17 mL of 0.5000 M NaOH. Calculate the concentration of H2SO4
bija089 [108]
The balanced equation for the above reaction is 
2NaOH + H₂SO₄ ---> Na₂SO₄ + 2H₂O
stoichiometry of NaOH to H₂SO₄ is 2:1
number of NaOH moles required-0.5000 M / 1000 mL/L x 21.17 mL = 0.010585 mol
According to stoichiometry, acid moles required are 1/2 of the base moles reacted
Therefore number of H₂SO₄ moles reacted - 0.010585 /2  mol
Number of moles in 42.35 mL of H₂SO₄ - 0.010585 /2 mol
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Molarity of H₂SO₄ - 0.125 M
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Which best describes how water's movement affects landforms? Select one 0 Mechanical weathering by water causes rock to break do
Diano4ka-milaya [45]

Answer:

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3 years ago
Nitrogen monoxide and hydrogen react to form nitrogen and water, like this: 2NO+2 H2(g)-N29)+2H2O(9) Write the pressure equilibr
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Answer:

Partial pressure N₂ . (Partial pressure H₂O)² / (Partial pressure H₂)² . (Partial pressure NO)² = Kp

Explanation:

The reaction is:

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The expression for Kp (pressure equilibrium constant) would be:

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There is another expression for Kp, where you work with Kc (equilibrium constant)

Kp = Kc (R.T)^Δn

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