The label on a chemical in a science laboratory reads, “Strong Acid.” Based on this label, what can a student best determine about the chemical? A. It has a low pH.
B. It is a clear liquid.
C. It has a high density.
D. It has a low melting point.

A. It has a low pH.

Explanation:

A.  It has a low pH

Explanation:

pH scale is 0 to 14 with 7 being neutral.  Any thing below 7 is acidic  Above 7 is a base or alkaline

Lower the pH the more careful you must be when handling the chemical.  Strong Acid can do irreparable harm to eyes, skin, mucus membranes, eat holes in clothing etc.  USE APPROPRIATE PPE

Below is pasted in definition you can look up in your textbook or online search.

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

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explanation:

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"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"