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A 0.1036 - g sample containing only BaCl , and NaCl is dissolved in 50 mL of distilled water . Titrating with 0.07916 M AgNO , requires 19.46 ml to reach the Fajans end point . Report the % w / w BaCl₂ in the sample .
What is the PH of a solution whose hydroxide
-3
ion (OH) is 0.003 moldm
how many atoms of calcium are in 6 moles of Ca?
Complete the table based on the following redox reactions: (12pts)
- CH4 + H2O à CO + 3 H2
- 2 AgNO3 + Cu à Cu(NO3)2 + 2 Ag
- Zn + 2 HCl à ZnCl2 + H2
Oxidizing agent Change in oxidation state Reducing agent
Change in oxidation state
a
b
c
Putrescine [H2N (CH2)4 NH2] is a neutral dramine isolated from rotten meats and Fish. It is the main compound responsible for its foul odour. Describe the structural features of this compound which can be obtained from its UV, IR and Mass and IVMR spectra
1 Calculate the frequency and wavenumber of an X-ray beam with a wavelength of 2.56Å.
2 Calculate the wavelength in cm and energy in joules of a photon of light with a frequency of 250MHz.
3 Guanosine has a maximum absorbance of 275nm. Ɛ= 8400 M-1 cm-1 and path length is 1cm, using a spectrophotometer, A was found to be 0.70. What is the concentration of guanosine?
4 The molar absorption coefficient of a glycogen-iodine complex is 0.20 at a light of 450nm. What is the concentration when the transmission is 40% in a 2cm cuvette?
8. Choose the most correct indicator given: 0.1L of a 1M HCl solution is added to a 0.1L of a 1.01M NaOH solution. (8 marks). Show your work for full marks.
a. Bromocresol green-the solution is blue
b. Phenol red- the solution is yellow
c. Alizarin yellow-the solution is dark orange
d. Phenolphthalein- the solution is colourless
9. Would it take more 0.1M HCl or 0.1M H2SO4 to neutralize 30mL of NaOH? Explain how you know. (2 marks)
4. A solution of HF contains 12 grams in 500.0mL. (5 marks)
a. Find [H+]. Make sure to show the ionization equation (with water)
. b. Calculate the pH of the above solution.
5. Predict the products of the following neutralization reactions (be sure to balance the equation and include states as well). (2 marks) a. HCl(aq) + Mg(OH)2(s) b. H3PO4(aq) + KOH(s)
A mixture of Al and Fe weighing 0.2000 g is treated with excess HCI solutions. Each metal reacts separately with the acid, resulting in the production of hydrogen gas H2, and a chloride salt. After treatment, a total volume of 200mL of the evolved gas was collected at 20 °C and 850 torr. Calculate for the mass percentage of Al in the sample.
An animal in hibernation gets the heat their body requires to survive from the biochemical combustion of fatty acids, linoleic acid C18H32O2, is an example of such fatty acid. If air is composed of 78.1% N2, 20.9& O2 and 1% other gases, by volume, calculate for the volume of air in liters needed to burn 1.50kg of linoleic acid at 25°C and 1 atm.
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