The ionic compounds below are all essentially insoluble in water. Which ONE of t

Question

The ionic compounds below are all essentially insoluble in water. Which ONE of the compounds will NOT dissolve readily in a strongly acidic solution? 31. In a titration in which NaOH solution is added from a buret to a solution of a weak acid in an Erlenmeyer flask, the pH of in the flask equals the pK, of the acid- Which of the following mixtures will be a buffer when dissolved in 1 L of water? The system is at equilibrium and the changes described below are made to it. After the sys has adjusted to these changes, state what effect each change would have on the amount o tresent in the system. In each case, your answer should be that the change would INCREA mount of CO_2, DECREASE the amount of CO_2, or will cause NO CHANGE in the amount of

Explanation / Answer

30. Chelation is a type of bonding of ions and molecules to metal ions. It involves the formation or presence of two or more separate coordinate bonds between a polydentate (multiple bonded) ligand and a single central atom. Usually these ligands are organic compounds, and are called chelants, chelators, chelating agents, or sequestering agents.

Basing on this, we can say that the correct option would be D, a catalyst.

31. Basically this happens when the half of the moles of the acid (or base) has reacted. When this happens, we have a ratio of acid and conjugate of 1, which means that pH = pKa. The part when the half has been consumed, is in the halfway equivalente point. Option E.

32. Usually a buffer is between a weak acid/base and it's respective conjugate. Basing on this, we can say that option B, when it's added in water, NH3 hydrolizes and forms NH4+ which is reacted with the Cl-. So option B is the right choice.

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