Answer:
1.58x10⁻⁵
2.51x10⁻⁸
0.0126
63.10
Explanation:
Phenolphthalein acts like a weak acid, so in aqueous solution, it has an acid form HIn, and the conjugate base In-, and the pH of it can be calculated by the Handerson-Halsebach equation:
pH = pKa + log[In-]/[HIn]
pKa = -logKa, and Ka is the equilibrium constant of the dissociation of the acid. [X] is the concentrantion of X. Thus,
i) pH = 4.9
4.9 = 9.7 + log[In-]/[HIn]
log[In-]/[HIn] = - 4.8
[In-]/[HIn] = ![10^{-4.8}](https://tex.z-dn.net/?f=10%5E%7B-4.8%7D)
[In-]/[HIn] = 1.58x10⁻⁵
ii) pH = 2.1
2.1 = 9.7 + log[In-]/[HIn]
log[In-]/[HIn] = -7.6
[In-]/[HIn] = ![10^{-7.6}](https://tex.z-dn.net/?f=10%5E%7B-7.6%7D)
[In-]/[HIn] = 2.51x10⁻⁸
iii) pH = 7.8
7.8 = 9.7 + log[In-]/[HIn]
log[In-]/[HIn] = -1.9
[In-]/[HIn] = ![10^{-1.9}](https://tex.z-dn.net/?f=10%5E%7B-1.9%7D)
[In-]/[HIn] = 0.0126
iv) pH = 11.5
11.5 = 9.7 + log[In-]/[HIn]
log[In-]/[HIn] = 1.8
[In-]/[HIn] = ![10^{1.8}](https://tex.z-dn.net/?f=10%5E%7B1.8%7D)
[In-]/[HIn] = 63.10
Answer:
The sample should be concentrated in less than 5mL of solvent
Explanation:
The sample should be concentrated in less than 5mL of solvent
column chromatography is a chemistry process used in isolating/extracting a chemical compound from a mixture
some examples of sample compounds used can be water or hydrogen peroxide
Answer:
Ionic solutes consist of oppositely charged ions that are attracted to each other, and
these solutes can be dissolved through ionization.
Explanation:
Ionic solutes consist of aggregate (the same number) of positive and negative charge ions.
Ionization brings about the conversion of neutral atoms to ions. So when ionic solute undergo ionization, it transform them into the respective ions which make up the ionic solute
Answer:
Name : Magnesium Fluoride
Formula : MgF2
Explanation:
Give me brainliest
<span>False. Foods that allow microorganism to grow are not called parasites. Parasites are organisms that feeds on the nutrients of its host.
For example leeches. They suck on our blood.
</span>Foods that allow microorganism to grow are called <span>potentially hazardous foods. They are high in protein and moisture and are slightly acidic.
For example hamburgers. They are high in protein and moisture.</span>