To find the number of moles of hydrochloric acid (HCl) that neutralized 25 cm³ of the solution, we can use the volume and concentration of the HCl solution.
The formula for calculating moles is:
\[ \text{Moles} = \text{Concentration (mol/dm}^3) \times \text{Volume (dm}^3) \]
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Convert the volume of HCl from cm³ to dm³: \[ 24.8 , \text{cm}^3 = \frac{24.8}{1000} , \text{dm}^3 = 0.0248 , \text{dm}^3 \]
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Given concentration of HCl: \[ \text{Concentration} = 0.100 , \text{mol/dm}^3 \]
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Calculate the number of moles of HCl: \[ \text{Moles of HCl} = 0.100 , \text{mol/dm}^3 \times 0.0248 , \text{dm}^3 = 0.00248 , \text{mol} \]
So, the number of moles of hydrochloric acid that neutralized 25 cm³ of the solution is 0.00248 moles.