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H₂SO₃    -  Acid

Sr(OH)₂   - Base

HF           - Acid

H₂C₂O₄   - Acid

BaF₃        - Salt

KNO₃      - Salt

(NH₄)₂SO₄  - Salt

CsOH        - Base

Explanation:

Acids are proton donors and as such have an H that they can easily donate.Bases are proton acceptors and as such are willing to accept a H into their system. The sometimes have H that could be donated, but this a less favorable reaction. Strong bases often are hydroxides.Salts are neutral compounds, often created by the reaction of acids and bases. You can often tell a salt by assessing where the cation and anion came from (e.g. KNO₃ is can be derived from KOH + HNO₃O)

The purpose of the probe of the thermostat on an appliance plug is mainly to transfer heat from the appliance to the thermostat. This is mostly to monitor the heat energy utilized and/or released by the appliance. Some appliances have manual control or switches which allow the user to optimize and decide the functionality of an appliance (i.e. simmer, fry, etc option for a pan with a thermostat).