Astudent determines the acetic acid concentration of a sample of distilled vinegar by titration of 25.00 ml of the vinegar with standardized sodium hydroxide solution using phenolphthalein as an indicator. which error will give an acetic acid content for the vinegar that is too low

Inaccuracy of the determined value for the acetic acid concentration of the sample can arise in many mishandling and error sources. One of the sources of error is the inaccuracy in the reading of through the glasswares used such as burette. 

Inaccuracy may also arise from the too much addition of sodium hydroxide to the solution, this means that endpoint had already been reached, however, the standard is still added. 

the catch is that the top numbers are atomic masses the bottom numbers are the numbers of protons and electrons in an uncharged atom. they are the number of that atoms as you would find them on the periodic table. further, the numbers on the left are used to determine the missing numbers on the right

so here we go

atomic mass

239 + 1 = y + 134 + 3 combine like terms

240 = y + 137             subtract 137 from both terms

240 - 137 = y

103 = y

atomic number

94 = z +54 + 0

94 = z + 54               subtract 54 from both sides.

40 = z

answer

C. chemical changeshope i : )