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tatyana61 [14]
3 years ago
14

An acid sample of an unknown concentration is contained in a erlenmeyer flask. Which technique below would be best suited to ana

lytically determine the number of moles of hcl in the sample?
Chemistry
1 answer:
Ivenika [448]3 years ago
4 0

Answer:

Titration

Explanation:

The best technique which can be used to determine the number of moles of the HCl in the sample is titration.

The given amount of HCl solution must be titrated with known concentration of the base like NaOH.

The volume of NaOH required must be noted also.

According to the reaction,

NaOH+HCl\rightarrow NaCl+H_2O

At equivalence point

Moles of HCl = Moles of NaOH

Considering:-

Moles of HCl=Molarity_{NaOH}\times Volume_{NaOH}

Thus, in this way, moles of HCl can be determined.

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Answer:

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2 years ago
PLEASE HELP ME WITH THIS QUESTION THIS FREAKING SUCKS
tigry1 [53]

Answer:

m = 0.122 m

Explanation:

Molality(m): A measure of the number of moles of solute in a solution corresponding to 1 kg or 1000 g of solvent.

\mathrm{Molality\:Formula}:\quad \mathrm m =  \dfrac{ mole\:of\:solute  }{ mass\:of\:solvent\:in\:kg  }

\mathrm m =  \dfrac{ mole}{ kg  }

\mathrm{Substitute\:the\:numbers\:into\:the\:"Molality\:Formula"}

\mathrm m =   \dfrac{ 0.250  }{ 2.05  }

\mathrm{Divide\:0.250\:by\:2.05\:and\:get\:0.12195122}

\mathrm m =   {0.12195122}

\mathrm{Round\:to\:the\:nearest\:thousandths\:place}

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