Which of the following combinations will produce a 0.4 m nacl solution?

a) mixing 500 ml of 0.4 m naoh with 500 ml of 0.4 m hcl
b) mixing 300 ml of 1.2 m naoh with 600 ml of 0.6 m hcl
c) mixing 500 ml of 0.4 m nacl solution with 500 ml water
d) diluting 400 ml of 0.6 m nacl with water to a final volume of 1.0 l

Option C: Mixing 500 mL of 0.4 M NaCl solution with 500 mL water

Explanation:

0.4M is [NaCl]

Molar concentration which means moles of solute in 1L.

How many moles, do we have in our volume of 500 mL

Molarity . volume = mole

0.4 mol/L . 0.5L = 0.2 mole

(remember convert mL to L)

This 0.2 mole of NaCl that were in 500 mL, are also in 500 mL of water, so In 1L of water, I have the double of mole, so 0.4M

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.