A 14.3 g sample of HF is dissolved into 250 mL of solution. The concentration of the solution is *
A. 2.86 M
B. 0.14 M
C. 7.1 M
D. 3.6 M

The concentration of the solution is 2.86 M

Explanation:

Molarity is a unit of concentration based on the volume of a solution. It is defined as the number of moles of solute that are dissolved in a given volume. In other words, molarity is defined as the number of moles of solute per liter of solution.

The Molarity of a solution is determined by the following expression:

Molarity is expressed in units ().

In this case, you must then know the number of moles of HF, for which you must know the molar mass. Being:

the molar mass of HF is: HF= 1 g/mole + 19 g/mole= 20 g/mole

Then the following rule of three applies: if 20 g of HF are available in 1 mole, 14.3 g in how many moles will they be?

moles= 0.715

So:

Replacing:

Solving:

Molarity= 2.86 =2.86 M

The concentration of the solution is 2.86 M

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.