Question 1a Explain the solubility results for boric acid in terms of polarity/ionisation of the solvent and solute. Answer text Question 3 Rich text editor
Added by Melissa H.
Step 1
Boric acid is a weak acid that can partially ionize in water, producing borate ions (B(OH)4-) and hydrogen ions (H+). It is a polar molecule due to the presence of hydroxyl (–OH) groups, which can form hydrogen bonds with water. Show more…
Show all steps
Your feedback will help us improve your experience
Sri K and 67 other Chemistry 101 educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
Boric acid (H3BO3) dissociates in water following the reaction: H3BO3 ⇌ H+ + H2BO3-. You dissolve a certain amount of H3BO3 in pure water, creating an aqueous solution. You are able to measure the undissociated fraction (i.e., H3BO3), and you find it has a concentration [H3BO3] = 16 mmol m-3. You also measure pH and realize that the solution has remained perfectly neutral (pH = 7). [You can ignore the second and third dissociations of H3BO3 for this problem.] (a) Determine if H3BO3 is a strong or weak acid. To do so, calculate the dissociation constant Ka and determine whether pKa > 2 or not. [2 points] (b) The total boron concentration in seawater is 420 mmol m-3. You create a new H3BO3 solution by dissolving exactly 420 mmol m-3 of H3BO3 in pure water. Determine the pH of the resulting solution, as well as the concentrations of the dissociated (H2BO3-) and undissociated (H3BO3) components. [3 points]
Sri K.
Ionisation of boric acid in aqueous medium gives which one of the following? (a) $\left[\mathrm{BO}_{3}\right]^{3-}$ (b) $\left[\mathrm{B}(\mathrm{OH})_{4}\right]$ (c) $\left[\mathrm{B}(\mathrm{OH})_{2} \mathrm{O}\right]^{-}$ (d) $\left[\mathrm{B}(\mathrm{OH}) \mathrm{O}_{2}\right]^{2-}$
Ionisation of boric acid in aqueous medium gives which one of the following? (a) $\left[\mathrm{BO}_{3}\right]^{-}$ (b) $\left[\mathrm{B}(\mathrm{OH})_{1}\right]^{-}$ (c) $\left[\mathrm{B}(\mathrm{OH})_{2} \mathrm{O}\right]^{-}$ (d) $\left[\mathrm{B}(\mathrm{OH}) \mathrm{O}_{2}\right]^{2-}$
Recommended Textbooks
Chemistry: Structure and Properties
Chemistry The Central Science
Chemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD
