Salicylic acid (C₇H₆O₃) reacts with acetic anhydride (C₄H₆O₃) to form acetylsalicylic acid (C₉H₈O₄).

What is the limiting reactant if 70.0 g of C₇H₆O₃ and 80.0 g of C₄H₆O₃ react?

The limiting reactant is the Salicylic acid (C₇H₆O₃)

Explanation:

In order to find the limting reactant or the excess reactant of a chemical reaction we have to compare the moles of each reactant to the stoichiometry of the reaction; we usually make rules of three.

First of all we need to convert the mass of the reactants, to moles:

70 g / 138 g/mol = 0.507 moles of salicylic acid

80g / 102 g/mol = 0.784 moles of acetic anhydride

The reaction is: 2C₇H₆O₃ (aq) + C₄H₆O₃(aq) → 2C₉H₈O₄(aq) + H₂O(l)

Ratio is 2:1.

2 moles of salicylic acid need 1 mol of acetic anhydride to react

Then, 0.507 moles of salicylic will react with (0.507 . 1) / 2 = 0.254 moles of acetic anhydride (It's ok, I have 0.784 moles and I only need 0.254 moles, so acetic anhydride still remains, the C₄H₆O₃ is the excess reactant)

In conclussion, the limiting reactant is the Salicylic acid (C₇H₆O₃)

Let's verify: 1 mol of anhyride  needs 2 moles of salicylic acid

Therefore, 0.784 moles of anhydride  will react with (0.784 . 2) /1 = 1.57 moles. → We do not have enough C₇H₆O₃, we have 0.507 moles but we need 1.57.

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.