If 30 mL of a stock solution of BaCl2 can be mixed with water to prepare 150 mL of 0.3 mgmL solution, what is the concentration of BaCl2 in the stock solution in mg/mL? Do not include units in your answer.

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.