Several common masking agents used in EDTA titrations are listed paired with a mixture of two metal ions. Classify each masking agent-metal ion combination by whether the masking agent is capable of masking one of the metal ions and still allowing the other metal ion to react with EDTA or not. Masks one metal ion but not the other triethanolamine: A1³+ and Pb²+ fluoride: Al³+ and Fe³+ cyanide: Ca²+ and Mn²+ Answer Bank Does not mask or masks both metal ions cyanide: Ni²+ and Pb²+ 2,3-dimercapto-1-propanol: B₁³ + and Pb²+ fluoride: Ti4+ and Cd²+

Predict the equivalence point that occurs for the following titrations: The when CO32 (aq) is titrated with HNO3 (aq). The when Ca(OH)2 (aq) is titrated with H2SO, (aq). Th v when HF (aq) is titrated with KOH (aq). equivalence point >7 equivalence point is less than 7 equivalence point = 7

In acetic acid/sodium acetate buffer the solute particles were Na+, C₂H3O2¯, and HC₂H3O2. With which of these particles did added hydroxide ions (from NaOH solution) react? H₂O O HC₂H₂O2 Na+ O H₂O + C₂H3O2™ C2H3O2 H₂O + HC₂H302

which of the following acids (listed with pKa values) and their conjugate base would form a buffer with a pH of 8.10? (see image)

A student does not filter his/her saturated solution before titrating. Will the calculated Ksp probably be too high, too low, or unaffected? Why? Solid substances are not part of equilibrium equations, so their presence would leave the value of Ksp unaffected. The remaining solids would absorb excess H30+ ions during the titration, making the calculated value of [OH ], and thus Ksp, too low. O The remaining solids would dissolve during the titration to give more OH¯. The calculated Ksp would therefore be too high.

The titration on the right was performed by placing 10.00 mL solution in an Erlenmeyer flask and titrating it with 0.1000 M HCl. How many buffer regions are present in this titration? 1 3 4 2 The number of buffer regions cannot be determined from the titration curve.