Chemistry, 07.04.2020 20:37 Kakey1668

7. A student titrated a 15.00-mL sample of a solution containing a weak, monoprotic acid with NaOH. The titration required 17.73 mL of 0.1036 M NaOH to reach the equivalence point. Calculate the concentration (in M) of the weak acid in the sample.

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Answer from: memester74

The concentration of the weak acid, HA in the sample is 0.123 M

We'll begin by calculating the number of mole of NaOH in the solution. This can be obtained as follow:

Molarity of NaOH = 0.1036 M

Volume = 17.73 mL = 17.73 / 1000 = 0.01773 L

Mole of NaOH =.?

Mole = Molarity x Volume

Mole of NaOH = 0.1036 × 0.01773

Mole of KOH = 0.00184 moleNext, we shall determine the number of mole of weak acid, HA that will react with 0.00184 mole of NaOH. This can be obtained as follow:

HA + NaOH —> NaA + H₂O

From the balanced equation above,

1 mole of HA reacted with 1 mole of NaOH

Therefore,

0.00184 mole of HA will also react with 0.00184 mole of NaOH.

Finally, we shall determine the concentration of the weak acid, HA. This can be obtained as follow:

Mole of HA = 0.00184 mole

Volume = 15 mL = 15 / 1000 = 0.015 L

Concentration of HA =?

Concentration = mole / Volume

Concentration of HA = 0.00184 / 0.015

Concentration of HA = 0.123 M

Therefore, the concentration of the weak acid, HA in the sample is 0.123 M

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Answer from: apodoltsev2021

The concentration of the weak acid in the sample is 0.1224 M

Explanation:

The balanced chemical reaction is :

$HA+NaOH\rightarrow NaA+H_2O$

To calculate the volume of acid, we use the equation given by neutralization reaction:

n_1M_1V_1=n_2M_2V_2

where,

$n_1,M_1\text{ and }V_1$ are the n-factor, molarity and volume of acid which is

$n_2,M_2\text{ and }V_2$ are the n-factor, molarity and volume of base which is NaOH.

We are given:

$n_1=1\\M_1=?\\V_1=15.00mL\\n_2=1\\M_2=0.1036M\\V_2=17.73mL$

Putting values in above equation, we get:

$1\times M_1\times 15.00=1\times 0.1036\times 17.73\\\\M_1=0.1224$

Thus the concentration (in M) of the weak acid in the sample is 0.1224

Answer from: Quest

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.

Answer from: Quest

The answer is 65.3312

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7. A student titrated a 15.00-mL sample of a solution containing a weak, monoprotic acid with NaOH....

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