Which of the following is true about an acidic solution? a) its ph is below 7. b) its hydrogen ion concentration is low. c) it is neutral. d) it can act as a buffer.

The answer is A

it cant be B as an acid contains a lot of H+ ions 
it cant be C as the solution is acidic not neutral
it cant be D as a buffer makes sure a reaction maintains constant in and around 7
hope that helps 

The one that is true about acidic solution is : A. Its ph is below 7

Ph ranged from 0-14. 

Ph 7 marked a neutral state which is nor acid or base. Above 7 marked a base solution and acidic solutions are all below PH 7

hope this helps

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