Answer:
pKa of the acid is 3.6
Explanation:
When a weak acid, HX, reacts with NaOH, the conjugate base, X⁻, is produced:
HX + NaOH → X⁻ + Na⁺ + H₂O
At the half neutralized solution, [HX] = [X-]
Based on Henderson-Hasselbalch equation:
pH = pKa + log [ X⁻] / [HX]
<em>Where pH is the pH of the buffer = 3.6</em>
<em>pKa is the pka of the solution</em>
<em>And as [ X⁻] = [HX], [ X⁻] / [HX] = 1</em>
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Replacing:
3.6 = pKa + log 1
3.6 = pKa + 0
<h3>pKa of the acid is 3.6</h3>
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Answer:
Hydrogen bonding
Step-by-step explanation:
The O-H bonds in water are highly polar.
There is an especially strong type of dipole-dipole attraction between the partially positive H atom in one molecule and the partially negative O atom on a nearby molecule.
We call this type of intermolecular force hydrogen bonding.
The strong attractive forces mean that we must supply extra energy to separate the molecules from each other.
Water therefore has an <em>unusually high boiling point
.</em>
Answer:
Mass, temperature, and phase.
I think temperature because the higher the temperature of a given quantity of a substance, more is its thermal energy. Similarly, for the same temperature, higher mass of a substance will contain more thermal energy.
Answer: 1.07×10^-20microlitre
Explanation:
1cm3 = 1000microlitres
1.07×10^-23 cm3 of tungsten = 1.07×10^-23 x 1000 = 1.07×10^-20microlitre
Basically, every moles of H2O has around 6.022 x 10^23 Molecules
So for 2.00 moles, the amount of molecules would be :
2x 6.022 x 10^23
= 12.044 x 10^23