No, not necessarily. It is highly corrosive, which means it reacts with your skin and cause rashes.
The substances with pH 11 and pH 13 are both basic (alkaline) in nature. They cannot be neutralized with an antacid; it would have to be done with an acid.
poison
it would be a substance with a pH of 13
Depends what the substance is! Yes, a pH of 13 is VERY high. Depending on the substance, it can be safe to touch (such as bleach), but probably not to drink. There is more to consider than pH when deciding whether something is dangerous, though.
Sodium hydroxide.
Alkali isn't an acid. Alkali and acid are terms used when the pH of a substance is a certain number, for example if a substance has a pH of 1, 2, 3, 4, or 5, then the substance is an acid. If the pH is 11, 12, 13, 14 or 15, then the substance is an alkali.
If a substance has a PH of 11 then the substance is basic.
The pH is the negative log of the concentration of hydronium ions. (pH=-log [H3O+]) If the pH is high, the substance is basic. If it is low the substance is acidic. When the pH is exactly 7 the substance is neutral.
Most acidic is substance of pH of 2, then of pH of 5 and the substance of pH 7 is neutral and the substance of pH 11 is basic
Classify a substance that has negative pH value. Foods that have acids in them is a substance hat have pH.
A substance with a pH of 7 is not acidic nor is it basic. It is a neutral substance.
The pH scale ranges from 0-14 pH. A substance that has a pH of 7 is considered to be "neutral," like pure water. A substance that has a pH less than 7 is said to be acidic, and a substance that has a pH greater than 7 is said to be basic. Therefore, the difference between those two pH levels is that the 4 pH substance is more acidic and the 10 pH substance is more basic. The more basic or acidic, the more caustic and/or corrosive the substance will be.