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The leaf compost jar and the control jar both contained the same initial volume and concentration of NaOH. Explain why the control jar required a larger volume of HCl than the leaf compost jar did to reach the end point of the titration.
A pair of students forgets to precipitate the carbonate ions in their leaf compost jar's NaOH solution prior to the HCl titration. How would this affect the perceived amount of NaOH present in the titrand?
How would forgetting to precipitate the carbonate ions affect the perceived amount of CO2 given off by the leaves?
Stoichiometry limiting reagent: find the reagent in excess. then calculate the mass or volume of the products formed.
At what pH would the side chain of histidine exist predominately in a form that could be involved in an ionic bond?
Consider the cell described below: Al| Al3+ (1.00 M) || Pb2+ (1.00 M) | Pb Calculate the cell potential after the reaction has operated long enough for the [Al3+] to have changed by 0.60 mol/L.
The pKa of one of the hydrogens that is attached to one of the nitrogens of the purine guanine is 9.7. If guanine is in a solution that has a pH of 10.2, then what fraction of the guanine molecules would be in the protonated form at this pH?
How are crops genetically modified? What are the health consequences of athletic supplements? How do fuel cells work? How does aspirin cure headaches?
An alpha particle (mass = 6.6 multiplied by 10-24 g) emitted by radium travels at 3.2 multiplied by 107 ± 0.1 multiplied by 107 mi/h. What is its de Broglie wavelength (in meters)
A compound is known to contain 51.27% carbon and 27.30% oxygen by mass. Each molecule contains two atoms of oxygen. What is the molar mass of this substance
Explain the standard cell potential (Eocell) for the reaction below is 1.21V. Define what is the value of Go for the reaction
For a metal salt (MX3) that has a Ksp value of 3.5 x 10-5, what is the delta G for the following reaction? M3+ + 3 X- MX3(s)
Question- When a 3.00-g sample of KCN is dissolved in water in a calorimeter that has a total heat capacity of 1.348 kJ•K-1, the temperature decreases by 0.400 K. Calculate the molar heat of solution of KCN.
Compute the ratio of the masses of the buffer components (NH3/NH4Cl) necessary to make the buffer with a pH of 9
Find the mass of urea needed to prepare 49.5 of a solution in water in which the mole fraction of urea is 7.51×10?2
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