<h3>
Answer:</h3>
Final volume is 120 L
<h3>
Explanation:</h3>
- Using the dilution concept, dilution involves adding more solvent to a concentrated solution to make it dilute. This results to a dilute solution with less solute concentration and more solvent.
According to the dilution equation;
M1V1 = M2V2
Where, M1 is the molarity and V1 is the volume of the concentrated solution, while M2 and V2 are the molarity and volume of the diluted solution respectively.
In this case;
M1 = 12.0 M
V1 = 30 L
M2 = 3.0 M
V2 = ?
Therefore;
V2 = M1V1 ÷ M2
= (12 × 30) ÷ 3
= 120 L
Hence, the final volume will be 120 liters
Answer:
When dealing with the force of gravity between two objects, there are only two things that are important – mass, and distance. The force of gravity depends directly upon the masses of the two objects, and inversely on the square of the distance between them.
Answer:
10.86
Explanation:
Given that:
Concentration = 0.0288 M
Consider the ICE take for the dissociation of ammonia as:
NH₃ + H₂O ⇄ NH₄⁺ + OH⁻
At t=0 0.0288 - -
At t =equilibrium (0.0288-x) x x
The expression for dissociation constant of ammonia is:
x is very small, so (0.0288 - x) ≅ 0.0288
Solving for x, we get:
x = 7.2×10⁻⁴ M
pOH = -log[OH⁻] = -log(7.2×10⁻⁴) = 3.14
Also,
pH + pOH = 14
So, pH = 10.86
Answer:
b) [bicarbonate]/[carbonic acid] = 9.4
Explanation:
The pH of a buffer system is given by the Henderson-Hasselbach equation:
- pH = pKa + log ([bicarbonate] / [carbonic acid])
Where pka = -log (Ka) = -log(4.2x10⁻⁷) = 6.38
Now we <u>solve for [bicarbonate] / [carbonic acid]</u>:
- 7.35 = 6.38 + log ([bicarbonate] / [carbonic acid])
- 0.97 = log ([bicarbonate] / [carbonic acid])
= [bicarbonate] / [carbonic acid]
- [bicarbonate] / [carbonic acid] = 9.33 ≈ 9.4
So the answer is b).