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Phosphorous acid, $\mathrm{H}_{3} \mathrm{PO}_{3}(a q),$ is a diprotic acid with $K_{\mathrm{a}_{\mathrm{1}}}=3 \times 10^{-2} .$ (a) After examining the $K_{\mathrm{a}}$ values in Table $15.5,$ estimate $K_{\mathrm{a}}$, for $\mathrm{H}_{3} \mathrm{PO}_{3}(a q)$ and calculate the $\mathrm{pH}$ of a $0.10 \mathrm{M}$ solution of $\mathrm{Na}_{2} \mathrm{HPO}_{3}(a q)$. (b) The structure of $\mathrm{H}_{3} \mathrm{PO}_{3}$ is given in Figure 15.5. Explain why $\mathrm{H}_{3} \mathrm{PO}_{4}(a q)$ is a triprotic acid, but $\mathrm{H}_{3} \mathrm{PO}_{3}(a q)$ is only a diprotic acid.

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Chemistry 102

Chapter 15

Acids and Bases

Liquids

Carleton College

University of Central Florida

University of Toronto

Lectures

03:07

A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, a liquid is one of the four fundamental states of matter (the others being solid, gas and plasma). A liquid is made up of tiny vibrating particles of matter, such as atoms, held together by intermolecular bonds. Water is, by far, the most common liquid on Earth. Like a gas, a liquid is able to flow and take the shape of a container. Most liquids resist compression, although others can be compressed. Unlike a gas, a liquid does not disperse to fill every space of a container, and maintains a fairly constant density. A distinctive property of the liquid state is surface tension, leading to wetting phenomena.

04:38

A liquid is a state of matter in which a substance changes its shape easily and takes the form of its container, and in which the substance retains a constant volume independent of pressure. As a result of this, a liquid does not maintain a definite shape, and its volume is variable. The characteristic properties of a liquid are surface tension, viscosity, and capillarity. The liquid state has a definite volume, but it also has a definite surface. The volume is uniform throughout the whole of the liquid. Solids have a fixed shape and a definite volume, but they do not have a definite surface. The volume of a solid does not vary, but the volume of a liquid may vary.

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Phosphorous acid, $\mathrm…

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$\mathrm{H}_{3} \mathrm{PO…

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The $K_{z_{1}}$ of phospho…

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The $K_{\mathrm{a}_{1}}$ o…

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mhm. Before solving for the hydrogen ion concentration, let's see if we can make our assumption 100 times K one Ends up being five which is greater than the concentration of our acid. So we need to use the quadratic formula. It's okay. One will be equal to the hydro knee um concentration squared divided by the concentration of phosphoric acid minus the hydro knee um concentration. When we use the quadratic formula we get hydro knee um equal to .020 Mueller. Based on this like geometry of the K. One reaction we get one H two people four minus every time we get one H 30 Plus. Therefore these two concentrations are equal and they're both point to Mueller. The K two expression is hydro knee um concentration multiplied by the H. P. 043 to minus concentration divided by the H two p. 03 minus concentration. But we established that these two concentrations were equal so they will cancel. And the h peel 43 to minus concentration is simply equal to K two Phs and the negative log of two or 70

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