You used your standardized sodium hydroxide solution (NaOH) to determine the molarity of an unknown sample of acetic acid (CH3COOH). In doing so you performed two fine titrations. What molarity did you obtain for the acetic acid solution?

Given:

*Molarity NaOH = 0.0999M
*Total volume of acetic acid solution = 100mL (25mL acetic acid, 75mL water)
*Volume NaOH dispensed from burette = 9mL
*Balanced formula = CH3COOH + NaOH → CH3COONa + H2O

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.