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neonofarm [45]
3 years ago
14

How do you pass sience

Chemistry
1 answer:
MariettaO [177]3 years ago
8 0

Answer:

Listen in Class. The first step to passing any test is to begin preparing right there in the classroom. ...

Review Lab and Lecture Notes. ...

Know the Vocabulary. ...

Develop a Study Schedule. ...

Take Advantage of Online Study Resources.

Explanation:

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pH is a symbolic representation of:

pH=-\log \lbrack H^+\rbrack

and for water we now that:

\lbrack H^+\rbrack\lbrack OH^-\rbrack=10^{-14}

that means the text give us the information to calculate the concentration of protons and therefore the concentration of ions OH-:

pH=10.2\rightarrow\lbrack H^+\rbrack=10^{-10.2}^{}

therefore the concentration of OH- can be calculated:

\lbrack OH^-\rbrack=\frac{10^{-14}}{10^{-10.2}}=10^{-3.8}=1.58\times10^{-4}\text{ M}

but they are not asking about the concetration of OH- they ask about concentration of Ba(OH)2 and for that we need to know the disolution stechiometry

Ba(OH)_2\rightarrow Ba^++2\times OH^-

Whic mean the concentration of Ba(OH)2 is half the concentration of OH-:

\lbrack Ba(OH)_2\rbrack=\frac{\lbrack OH^-\rbrack}{2}=7.92\times10^{-5}M

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