Moles of HCl = 0.282
<h3>Further explanation</h3>Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution
Where
M = Molarity
n = number of moles of solute
V = Volume of solution
The volume of HCl=62.2 ml=0.0622 L
The molarity of HCl = 4.54 M
Then moles of HCl :
The pH of the diluted HCl solution is 1.3.
Explanation:
Given:
The concentrated HCl solution of 8.0 M. The 1.5 mL of 8.0 M HCl is diluted with water to 250 mL volume.
To find:
The pH of the diluted HCl solution.
Solution
Using the Dilution equation:
The concentration of diluted HCl solution = 0.048 M
In the 1 M solution of HCl, there are 1 M of hydrogen ion, then the concentration of hydrogen ions in 0.048 M of HCl will be:
The pH of the diluted HCl solution :
The pH of the diluted HCl solution is 1.3.
Learn more about the dilution equation here:
Taking into account the definition of calorimetry, the mass of the sample is 159.85 grams.
<h3>What is calorimetry</h3>In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .).
The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
In this case:
Replacing in the expression to calculate heat exchanges:
3750 J= 1.02 × m× 23 C
Solving:
m= 3750 J ÷ (1.02 × 23 C)
<u><em>m= 159.85 grams</em></u>
In summary, the mass of the sample is 159.85 grams.
Learn more about calorimetry:
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