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A Order the following chemical bonds in order of increasing strength. (Hydrogen Bond, Covalent Bond, Ionic Bond, van der Waals interaction)
b. What is the pH of a 0.1 mM solution of NaOH?
c. What type of bonds exist in a water molecule? (Polar Covalent, Hydrogen, Non-Polar Covalent, van der Waals, Ionic bonds)
Expert Answer
(a.) Order of increasing strength:
van der Waals interaction < Hydrogen Bond < Covalent Bond < Ionic Bond
(b.) Given, [OH-] = 0.1 mM = 10-4 M
Now, pOH = -log[OH-]
pOH = -log10-4
pOH = -(-4)
pOH = 4
Now, pH = 14 – pOH
pH = 14-4
pH = 10
(c.) The bond in water molecule belongs to Polar Covalent bond as there is a difference between O and H atoms. So the electron density shift towards O atom as it is more electronegative atom.
There is H-bonding between water molecule (between two H2O molecule).
