Answer:



Explanation:
Hello!
In this case, since the phosphoric acid is a triprotic acid, we infer it has three stepwise ionization reactions in which one hydrogen ion is released at each step, considering they are undergone due to the presence of water, thus, we proceed as follows:



Moreover, notice each step has a different acid dissociation constant, which are quantified in the following order:
Ka1 > Ka2 > Ka3
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Answer:
Ionically, because they are ionic compounds
Answer: There are
a) 2.12 g of Ir-192 after 199.2 days
b) 0.52 g of Ir-192 after 350 days
Explanation:
Radioactive decay follows a first-order kinetics since <em>the half life does not depend on the initial amount,</em> then the equation which describes this process is:

Where
is the amount given a certain t time, and
is the initial amount.
is the half life.
Then, the radioactive decay equation for this problem is:

Note that the half life and the given time t must be on the same units, in this case days. Finally you calculate the amount for a) 199.2 days and b) 350 days:


Hope it helps!
Answer:
2
Explanation:i did the test