Refer to the table given for the ionic radii in your lab manual and approximate

Question

Refer to the table given for the ionic radii in your lab manual and approximate the attractive portion of the lattice energy for 1 mole of the following salts. (Consider only one bond if more than one bond exists.)

(a)    CuCl2 (in J)
(b)    KBr (in J)
(c)    BeO (in J)

Using the values you just calculated, rank the salts from least to most soluble based on their attractive portion of their lattice energy. (Use the appropriate <, =, or > symbol to separate substances in the list.)

The following data was collected after running a calorimetric experiment using three salts.

Table 1: Hsol Values of Salts

Experiment 1: 2.48 g of unknown salt added to 140. mL of water resulted in a T value of 0.2°C.The data collected for each experiment is as follows.

Experiment 2: 2.48 g of unknown salt added to 140. mL of water resulted in a T value of 2.0°C.

Experiment 3: 2.48 g of unknown salt added to 140. mL of water resulted in a T value of 0.8°C.

Calculate the value of q for each of the experiments. (Assume that the heat capacity of water is 4.1801 J/g·°C.)

Based on the magnitude and sign of the q values calculated, determine the identity of the salt used in each experiment and the resulting Hsol based on that deduction. (NOTE: You can also calculate Hsol to see if your deduction makes sense when compared to the known values given above.)

LiI

LiNO3

LiF

LiI

LiNO3

LiF

LiI

LiNO3

LiF

Explanation / Answer

KBr > CuCl2 > BeO

KBr is more soluble copper(II) chloride which is more soluble than BeO.As BeO is almost insoluble in water.

678g/L(250C) > 75.7g/L(25o C) > almost insoluble

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