CHY 103 Chapter Notes - Chapter 3: The Units, Titration, Stoichiometry

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16 May 2014

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A solution can be described as a homogeneous mixture of two or more substances. These substances can be classified as the ___________ or ________________. The solvent is the substance that is present in the greatest quantity and in the same state as the solution. If the substance happens to be water then the solution is said to be. The solute(s) is/are the substance or substances dissolved in the solvent. The term ______________is used to describe how much solute is dissolved in the solution. The units of concentration are typically the ________________ (m) of the solution. moles of solute per liter of solution and is referred to as. A 1m kcl (aq) solution is really __________________ and____________________ A 1m ca(no3)2 (aq) solution is really _________________and ___________________ In chemistry many chemicals are purchased as concentrated solutions, e. g. concentrated hydrochloric acid is 12 m. however, the chemist often wants to use a less concentrated form, say 1.

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Please help me solve for the molar mass of sample 1 and 2 and the molecular formula

Experiment 1084-03: Determination of M.M. by Freezing Point Depres sion Measure the freezing-point depressions solute whose empirical formula is known Pool the class hat occur with solutions containing mass of the solute and its Background Information However, as soon as the solution begins to freeze, Adding a solute to a pure, non-volatile lquid ature will remain constant untl all the (solvent) lowers the vapor pressure of the solvent raises its boiling point, and lowers (depresses) its freezing point. The extent to which these are aftected depends on the relative number of solute particlos in the solution. Properties of solutions that depend only on the number of solute molecules in a given quantity of solvent are called colligative properties. Such cyclohexane turns into solid. Once the substance again. The freezing point is the temperature where it stays constant, Le. the liquld phase and the sold phase of the cyclohexane coexists (Figure 3-1) boiling point elevation and osmotic pressure. They do NOT dopend on the nature of the solute, but DO depend on the nature of the solvent. As a consequence, colligative properties can be used to determine an unknown molar mass for a solute. In this experiment, we will be using cyclohexane (d " 0.779 gmL, K, . 20.5 oC/m) as the solvent to determine the molar mass of a white solid with an empirical formula of C,HC. The freezing point depression, Î7, is the difference between the freezing point of the pure solvent, TP, and the freezing point of the solution (solvent and solute). T As mentioned above, thits quantity is proportional only to the molal concentration of the solute, m Figure 3-1. Cooling Curves The proportionality constant, K, is called the freezing-point-depression constant. The K value of 20.5 C/m for Cyclohexane is one of the largest values one can find. Molal concentration is defined as the number of moles of substance in 1 kg of solvent. Now we can calculate the molar mass of a solute from ATã K,, the mass of the The freezing point of a solution in cyclohexane can be obtained in a similar way. Cooling results in an initial rapid decrease in the temperature until freezing begins as seen in the cooling curve of the pure solvent. However, the temperature of the solution does not remain constant while being frozen. As the cyclohexane in the solution treezes, cyclohexane is taken away from the solution and the concentration of the solute becomes higher In the liquid portion. Thus the molal concentration of the solute increases and the freezing point of the solute and the mass of the solvent. remaining liquid becomes lower. The result is a steadily decreasing freezing temperature until the solution is completely frozen. When all the solution In order to determine ATP, we will measure the freezing point of pure cyclohexane and the freezing point of a solution of the solute in is frozen, the temperature decreases more rapidly To evaluate the freezing point of pure cyclohexame, you will cool a sample of this substance, and measure the temperature as a The freezing point of the solution is the temperature at which the solution starts to freeze. portion represents the concentration of the starting function of time. As cooling begins, theOnly at this point, the concentration of the liquid temperature of the cyclohexane decreases rapidly.

Consider the equilibrium reaction for the saturated solution of a salt, A B 3 : A B 3 (s)? A 3+ (aq)+3 B ? (aq) For each A B 3 formula unit that dissolves in water, the number of B ? ions is three times the number of A 3+ ions. In a saturated solution of the salt A B 3 , the number of formula units of the salt dissolved equals the number of dissolved A 3+ ions. If you know the concentration of the dissolved ions in a saturated solution, the solubility of the solute, S , can be calculated for the system. Solubility can be expressed as a molar concentration. The molar concentration or the molarity of the solution, M , is equal to the number of moles of solute per liter of the solution: molar concentration (M) = moles of solute volume of solution (L)

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Part C Go to the Slightly Soluble Salts tab. Set the volume to 1.0Ã 10 ?16 L . Select the salt thallium sulfide from the dropdown menu. In the text box provided, set the total number of ions under the data for "cations" to 8 to make the solution saturated. Calculate the solubility in M of thallium (I) sulfide for a saturated solution. Express your answer numerically in moles per liter to three significant figures. I dont know which thalium sulfide it is so if you could do both i would appreciate it/

CHY 103 Chapter Notes - Chapter 3: The Units, Titration, Stoichiometry

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