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In lab performed experiments where we combine a certain amount of HCL with NAOH. For instance, 25ml of 1M HCL we then measured temp then we added 75 ml of 1M NaOH then we measure the temp. Explain what are the moles of H+, moles of OH-, and moles of H2O. Explain what is the heat released during reaction. Also what is the enthalpy of neutralization? Does doubling the volumes of acid and base double the amount of heat? Does doubling the concentration of acid base double the amount of heat released?
HClO is a weak acid (Ka = 4.0 × 10-8) and so the salt NaClO acts as a weak base. What is the pH of a solution that is 0.087 M in NaClO?
What is the standard reaction enthalpy for which the equilibrium constant is doubled when the temperature is increased by 10 C at 298 K
The pH at the ¼ neutralized point in the titration of a weak acid is 3.958. What is the pKa of this acid
A 250.0-L cylinder contains 65.0% He(g) and 35.0% Kr(g) by mass at 25.0° C and 1.35 atm total pressure. What is the partial pressure of He in this container
A 50 mL soln. of Mg(NO3)2 is mixed with a 50 mL solution of NaOH. The resulting precipitate, Mg(OH)2, that forms is 2.97g. Determine the concentration of solution of Mg(NO3)2
A Solution was analyzed using AA spectroscopy for Au. The signal registered was 150. The sample solution was placed in a 10ml container and spiked with 2ml of a 0.125mM standard Au solution. The spiked solution returned a AA signal of 185. What wa..
The pH of 0.5 M HF is 1.88. Calculate the difference in pH when 6.06 g of NaF is added to 205.7 mL of this solution. Ignore any changes in volume. The Ka value for HF is 3.5 x 10-4.
At 25 c the ion product of water, Kw is 1.9 x 10^-14. What is the concentration of hydroxide ions in a solution where the concentration of hydrogen is found to be 5.0 x 10^-15 mol dm^-3.
what is the molality of a solution prepared by dissolving 413 mg of kbr in 6.45 ml of water at 25.0 0c. the density of
In a coffee-cup calorimeter, 1.40 g of NH4NO3 is mixed with 79.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.23°C.
A flask contains 0.500 mol of liquid bromine, rm Br_2. Determine the number of bromine molecules present in the flask.
Use the balanced redox reactions and the standard cell potential to predict the volume of hydrogen gas (at STP) required each month to generate the electricity needed for a typical house. Assume the home uses 1600kWh of electricity per month.
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