I would go with C. SDS and warning signs
<h3>Answer:</h3>
<u>Easy</u><u>!</u><u>!</u>
2+<u>1</u><u>7</u>=19
#<em>h</em><em>o</em><em>p</em><em>e</em><em> </em><em>that</em><em> </em><em>helps</em>
Answer:
An acidic solution has a high concentration of hydrogen ions (H +start superscript, plus, end superscript), greater than that of pure water.
It will become an ion and no longer be neutral
N(Ca)/2 = n(O)/1 = n(CaO)/2
The calcium and the Calcium Oxide are divided by 2 because of their coefficients
there is no number in front of the oxygen so it is over one.
Hope this helped!!