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3 years ago

When physical properties are measured their identity will be changed. True or False

Chemistry

1 answer:

wolverine [178]3 years ago

5 0

Answer:

False

Explanation:

A physical change is a change to a sample of matter in which some properties of the material change, but the identity of the matter does not.

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A 0.15 m solution of chloroacetic acid has a ph of 1.86. What is the value of ka for this acid?

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Answer: $1.67\times 10^{-3}$

Explanation:

$ClCH_2COOH\rightarrow ClCH_2COO^-+H^+$

cM 0 0

$c-c\alpha$ $c\alpha$ $c\alpha$

So dissociation constant will be:

$K_a=\frac{(c\alpha)^{2}}{c-c\alpha}$

Given: c = 0.15 M

pH = 1.86

$K_a$ = ?

Putting in the values we get:

Also $pH=-log[H^+]$

$1.86=-log[H^+]$

$[H^+]=0.01$

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As $[H^+]=[ClCH_2COO^-]=0.01$

$K_a=\frac{(0.01)^2}{(0.15-0.15\times 0.06)}$

$K_a=1.67\times 10^{-3]$

Thus the vale of $K_a$ for the acid is $1.67\times 10^{-3}$

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When physical properties are measured their identity will be changed. True or False​

When physical properties are measured their identity will be changed. True or False