types of field oxides and their comparisons
In: Chemistry
Consider a 1.0 L buffer containing 0.083 mol L-1 HCOOH and 0.095 mol L-1 HCOO-. What is the pH of the solution after adding 6.0 x 10-3 mol of NaOH? Express your answer to 2 decimal places.
i'm repeatedly getting 3.87 as my answer....would really appreciate some help!
In: Chemistry
Explain the difference between class and individual characteristics. What class and individual characteristics would an examiner look for in fingerprints? Bullets/cartridge casings? and footwear impressions?
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2.0 mL of 0.5M HCl was added to 50 mL of 0.5M Formate-formic acid buffer at pH 3.6. (pKa= 3.75) What is the resulting pH after the addition of HCl?
2.0 mL of 0.5M HCl was added to 50 mL of 0.0625M Formate-formic acid buffer at pH 3.6. (pKa= 3.75) What is the resulting pH after the addition of HCl?
1.0 mL of 0.6M NaOH was added to 10 mL of 0.5M Acetate-acetic acid buffer at pH 4.2. What is the resulting pH after the addition of NaOH?
0.5 mL of 0.3M NaOH was added to 10 mL of 0.5M Acetate-acetic acid buffer at pH 4.2. What is the resulting pH after the addition of NaOH?
In: Chemistry
. Assuming a single hydrogen bond contributes ΔG ≈ -0.9 kcal/mol, calculate the contribution of the R38 hydrogen bonds to the IL2/IL2Rα binding free energy.
A) -2.7 kcal/mol
B) -0.9 kcal/mol
C) -1.8 kcal/mol
D) -3.6 kcal/mol
In: Chemistry
In: Chemistry
pH of acetic acid solutions. Remember, acetic acid is a weak acid, with a Ka = 1.8 x 10−5.
Obtain 10.0 mL of 0.10 M acetic acid and place in a clean dry 50.0 mL beaker. Predict the value of the pH. Measure the pH with the pH meter. Record the value.
Take 1.00 mL of the 0.10 M CH3COOH(aq) in the previous step, and put it in another clean beaker. Add 9.00 mL of deionized water and stir. What is the new concentration of CH3COOH(aq)? Predict the pH. Measure the pH. Record the value.
Add 90.0 mL of deionized water to the diluted CH3COOH(aq) in step 2. What is the new concentration of CH3COOH(aq)? Predict the pH. Measure the pH. Record the value.
In: Chemistry
Titration of a 15.0 mL solution of KOH requires 17.0 mL of 0.0250 M H2SO4 solution.
What is the molarity of the KOH solution?
M=?
In: Chemistry
In: Chemistry
Is it impossible to overdose on Vitamin C? Please explain. Site references.
In: Chemistry
The temperature of 500 mL of distilled water in a flask is between 70°C and 90°C. Room temperature is 20°C. the useful range of the only thermometer available is between 0°C and 50°C. Briefly describe an experiment you could carry out which would allow you to determine exactly the temperature of the water in the flask. Indicate the following in your description:
What equipment would you use?
What would you do?
The equation(s) for any calculation(s) you would carry out, and which quantities would be measured, which would be calculated, and which would be constants.
In: Chemistry
You have been given the basic connectivity of two boron compounds. Complete the Lewis structures by adding lone pairs and/or multiple bonds where necessary. If there is more than one possible structure, draw the structure that minimizes nonzero formal charges and fulfills the bonding preferences for each atom.
A. B2CO, with connectivity BBCO, as shown.
B-B-C-O
B.C2B2O2, with connectivity OCBBCO as shown
O-C-B-B-C-O
In: Chemistry
How does NMR allow us to understand the connection between bond rotation and the kinetic energy within the sample being analyzed?
Background info: in this lab DEET or N,N-diethyl-m-toluamide is synthesized using the Schotten-Baumann synthetic method using m-Toluoyl chloride abd diethylamine solution
In: Chemistry
pick one of the transition element and talk about the element's physical, chemical properties, preparation, discovery, and industrial application of that element
In: Chemistry
Calculate the PH after the addition of 0.00, 5.00, 15.00, 25.00, 40.00, 45.00,49.00, 50.00, 51.00, 55.00 and 60mL of 0.100M HCl in the tirtration of 50.00mL of 0.100M weak Monoprotic base B. Kb of B is 9.52 *10^-7
In: Chemistry