A chemist dissolves 156. mg of pure hydrobromic acid in enough water to make up 220. mL of solution.

Calculate the pH of the solution.

Be sure your answer has the correct number of significant digits.

The pH of the solution is 2.06

Explanation:

Step 1: Data given

Mass of hydrobromic acid (HBr) = 156 mg = 0.156 grams

Molar mass HBr = 80.91 g/mol

Volume of the solution = 220 mL = 0.220 L

Step 2: Calculate moles HBr

Moles HBr = mass HBr / molar mass HBr

Moles HBr = 0.156 grams / 80.91 g/mol

Moles HBr = 0.00193 moles

Step 3: Calculate moles H+

For 1 mol HBr we have 1 mol H+

For 0.00193 moles HBr we have 0.00193 moles H+

Step 4: Calculatemolarity of H+

Molarity H+ = moles H+ / volume

Molarity H+ = 0.00193 moles / 0.220 L

Molarity H+ = 0.00877 M

Step 5: Calculate the pH

pH = -log[H+]

pH = -log (0.00877)

pH = 2.06

The pH of the solution is 2.06

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.

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