If you had to prepare 100 mL of a .5 M HCl solution from a 12 M stock HCl solution. How many mL would you need of the concentrated solution?

Each calcium ion has a charge of +2, which can also be written as ca2+. if those ions move out of the neuron and no other ions are moving, the neuron would lose the positive charge associated with those ions and become more negatively charged.