What will happen if a small amount of hydrochloric acid is added to a 0.1 m solution of hf?

pH will go down (become more acidic)

Explanation:

This is because HCl is strong acid that means it dissociates completely into H+ and Cl- ions. There's already some H+ ions in solution contributed by HF but addition of HCl supplies more H+ which drives the pH of solution down making the solution more acidic.

the answer is c i believe

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.