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How to write dissolution equations

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From: Christopher S.
Added: 17.04.2021
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Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry. It only takes a minute to sign up. Connect and share knowledge within a single location that is structured and easy to search. I had a recent question on a test that asked what the products would be if sodium hydrogen carbonate were dissolved in water. I had a few candidate answers.
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Sometimes when performing a calculation concerning a process at chemical equilibrium there are no simplifying assumptions that can be made. If the system is a relatively simple one, like the dissolution of a weak acid or base in water, the problem can be answered by solving a quadratic formula. At other times, the problem can be considerably more complex with many more species found in the solution. In such an instance the problem usually must be answered by writing and solving a set of simultaneous equations. To determine the number of equations needed, one must first determine the number of unknowns in the solution. As an example, consider the first problem that we solved in this course, a solution of ammonia in water. It turns out that in this case, there are four unknowns in the solution.
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Answers: 1 on a question: In a coffee cup calorimeter, 1. The mass of the solution is the sum of the masses of the water and ammonium nitrate originally placed in the calorimeter. Now Equations 2 - 6 may be substituted into Equation 1 to … 2. Answer link.
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Weak Acid Equilibrium. When an uncharged weak acid is added to water, a homogeneous equilibrium forms in which aqueous acid molecules, HA aq , react with liquid water to form aqueous hydronium ions and aqueous anions, A - aq. In writing an equilibrium constant expression for this homogeneous equilibrium, we leave out the concentration of the liquid water. The equilibrium constant for this expression is called the acid dissociation constant, K a.
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