Because of the toxicity of mercury compounds, mercury(I) chloride is used in antibacterial salves. The mercury(I) ion (Hg2 2+ ) consists of two bound Hg+ ions.
a. What is the chemical formula of mercury(I) chloride? (1 mark)
b. Calculate [Hg2 2+ ] in a saturated solution of mercury(I) chloride (Ksp = 1.5 x 10-18 ).
c. Seawater contains 0.03 kg of NaCl per litre. Using a suitable approximation, find [Hg2 2+ ] if the seawater is saturated with mercury(I) chloride.
d. How many grams of mercury(I) chloride are needed to saturate 4900 km3 of water (the volume of Lake Michigan)? e. How many grams of mercury(I) chloride are needed to saturate 4900 km3 of seawater?
In: Chemistry
In: Chemistry
Calculate the expected pH when 0.5 mL of 0.1 M HCL is added to 30.0 mL pure water. Do the same calculation when the same amount of HCl is added to 30.0 mL of your original .05M buffer. Compare the calculated pH to the actual measured pH.
My buffer has a pH of 5.09 and I used acetic acid which has a
pKa of 4.76
2.
If you have 50 mL of .05M potassium phosphate buffer pH 7.0 and you
added 2.0 mL of 0.1M HCl what would the final pH be? What would the
pH be if 2.0 mL of 0.1M NaOH was added to the same amount of the
original buffer?
In: Chemistry
12.0 L container of sulfur dioxide has a pressure of 285 Torr T -110oC. What mass of SO2 is present?
In: Chemistry
Which of the following compounds would produce a negative test for chromicacidand a positive test for 2,4-dinitrophenylhydrazine, be soluble in sulfuric acidand be insoluble in sodium bicarbonate: methyl m-nitrobenzoate, 2-pentanone, or 1-octanol?
In: Chemistry
Draw (1S,3S)-3-methylcyclopentanol and explain your reasoning.
In: Chemistry
Propose a method to test the antioxidant activity (DPPH Scavenging method) of organic compounds. Write a detailed report about the protocol. Write the purpose, materials, calculations, methods, etc.
In: Chemistry
Acetic acid has a normal boiling point of 118 ∘C and a ΔHvap of 23.4 kJ/mol.What is the vapor pressure (in mmHg) of acetic acid at 40 ∘C?
In: Chemistry
how do you find bond angle measurement with a line bond structures
In: Chemistry
One mole of an ideal gas at 1.00 atm and 298K with Cp,m=3.5R is put through the
following cycle: a) (reversible) constant volume heating to twice its initial
temperature; b) reversible, adiabatic expansion back to its initial temperature;
c) reversible isothermal compression back to 1.00 atm. Calculate ΔS for each step and
overall. d) What is the change of entropy of the surroundings?
In: Chemistry
A chemistry graduate student is given 100.mL of a 1.50M diethylamine C2H52NH solution. Diethylamine is a weak base with =Kb×1.310−3. What mass of C2H52NH2Cl should the student dissolve in the C2H52NH solution to turn it into a buffer with pH =11.35? You may assume that the volume of the solution doesn't change when the C2H52NH2Cl is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.
In: Chemistry
A. Which of the following can behave as Bronsted-Lowry bases in aqueous solution?
NO3-
H3PO4
NH4+
HClO
None of the Above
B. Which of the following can behave as Bronsted-Lowry bases in aqueous solution?
NH4+
NH3
Ca(OH)2
Br-
None of the Above
C. Which of the following can behave as Bronsted-Lowry bases in aqueous solution?
HCO3-
NaOH
KOH
HF
None of the Above
* please help me I am really struggling with this concept. I fully cannot seem to grasp it and really need to understand it*
In: Chemistry
Find the pH of each of the following solutions of mixtures of acids.
a) 0.120 MM in HBrHBr and 0.135 MM in HCHO2HCHO2
Express your answer to three decimal places.
b) 0.155 MM in HNO2HNO2 and 9.0×10−2 MM in HNO3HNO3
Express your answer to two decimal places.
c) 0.185 MM in HCHO2HCHO2 and 0.22 MM in HC2H3O2HC2H3O2
Express your answer to two decimal places.
d) 4.5×10−2 MM in acetic acid and 4.5×10−2 MM in hydrocyanic acid
Express your answer to two decimal places.
In: Chemistry
Osmium (76Os) has seven naturally occurring isotopes, six of which are stable. Osmium 193 is a beta-emitter. A sample of 193Os with mass of 58.36 μg emits 13.52×108 β
particles in a time interval of 32 min. What is the half-life (in years) of this nuclide?
In: Chemistry
1. What normally happens when iodine is added to starch?
2.Tube 2 contained starch at the beginning of the experiment. How do you explain the reaction with iodine at the end of the experiment?
3. What food substance is tested by using Benedict's solution?
In: Chemistry