<span>pH = pKa + log([A^-]/[HA])
[A^-] = [KF] = 0.43 M, [HA] = [HF] = 0.20 M
pKa = -logKa = -log(6.8x10^-4) = 3.17
pH = 3.17+ log(0.43 / 0.20) = 3.50
You can determine the [H3O^+] by using the equation for pH
pH = -log[H3O^+]
[H3O^+] = 10^-pH = 10^-3.50 = 3.16x10^-4 M</span>
Answer:
Option C is false statement. The half life of a second order reaction is not dependent on concentration.
Explanation:
Half life of a reaction is defined as the amount of time which is required for a reactant concentration reduced by half comparison to its initial concentration.
Half life of a second order reaction is depend on the initial concentration of a reaction, in contrast to 1st order reaction.
Average atomic mass is =1.11 u
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Explanation:
A property that does not bring any change in chemical composition of a substance are known as physical properties.
For example, shape, size, mass, volume, density, hardness etc of a substance are all physical properties.
On the other hand, a property that changes chemical composition of a substance is known as chemical property.
For example, precipitation, reactivity, toxicity etc are chemical property.
Therefore, given descriptions are separated according to their physical and chemical properties as follows.
Physical properties:
- Zinc has a hardness on the Mohs scale of 2.5 and a density of 7.13 g/cm3 at .
- Zinc melts at .
Chemical properties:
- When zinc granules are added to dilute sulfuric acid, hydrogen is given off and the metal dissolves.
- It reacts slowly with oxygen gas at elevated temperatures to form zinc oxide, ZnO.
Answer:
0 for the elemental form, +2 in its compounds.