The HCl is a strong acid, that is, it is fully consumed <span>in the reaction.
HCl(aq) ------------> H</span>₃O⁺(aq) + Cl⁻(aq)
↓ ↓ ↓
10⁻⁴ M 0 0
-10⁻⁴ +10⁻⁴ +10⁻⁴
_____________________________________
0 + 10⁻⁴ M <span> + 10⁻⁴ M
PH = - log [ H</span>₃O⁺ ]
PH = - log [ <span>10⁻⁴]
<span>PH = 4.0</span></span>
If the half-life is 8.0 hours and there are 24 hours in a day, the radioisotope reaches its half-life 3 times.
Therefore, after a full day, there are 24 g of the sample left, and 168 g has decayed.
Isotopes are atoms that have the same numbers of protons but different numbers of neutrons. An ion is an atom that has gained or lost electrons, so it now has more or fewer electrons than it does protons. So an ion has a negative or positive charge.
