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Answer: Scientific notation is used to express very large or very small numbers. ... Scientific notation numbers may be written in different forms. The number 6 x 109 could also be written as 6e +9. The + 9 indicates that the decimal point would be moved 9 places to the right to write the number in standard form
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The question is incomplete, here is the complete question:
What volume (mL) of the partially neutralized stomach acid having concentration 2M was neutralized by 0.01 M NaOH during the titration? (portion of 25.00 mL NaOH sample was used; this was the HCl remaining after the antacid tablet did it's job)
<u>Answer:</u> The volume of HCl neutralized is 0.125 mL
<u>Explanation:</u>
To calculate the concentration of acid, we use the equation given by neutralization reaction:

where,
are the n-factor, molarity and volume of acid which is HCl (Stomach acid)
are the n-factor, molarity and volume of base which is NaOH.
We are given:

Putting values in above equation, we get:

Hence, the volume of HCl neutralized is 0.125 mL
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Ecology is the branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
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