A solution has pH of 9 what is it?
2 answers:
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Answer:
0.136g
Explanation:
A student dissolved 5.00 g of Co(NO3)2 in enough water to make 100. mL of stock solution. He took 4.00 mL of the stock solution and then diluted it with water to give 275. mL of a final solution. How many grams of NO3- ion are there in the final solution?
Initial mole of Co(NO3)2
Mole of Co(NO3)2 in final solution
Mole of NO3- in final solution = 2 x Mole of Co(NO3)2
Mass of NO3- in final solution is mole x Molar mass of NO3
Answer:
The analytical concentrations of thiocyanate ions:
The analytical concentrations of ferric ions:
Explanation:
1) Moles of sodium thiocyanate = n
Volume of sodium thiocyanate solution = 5.00 mL = 0.005 L
(1 mL = 0.001L)
Molarity of the sodium thiocyanate =
1 mole of sodium thiocyanate has 1 mol of thiocyante ions.
So, moles of thioscyanate ions in of NaSCN.
2) Moles of ferric nitrate = n'
Volume of ferric nitrate solution = 2.00 mL = 0.002 L
Molarity of the ferric nitrate = 0.21 M
1 mole of ferric nitrate has 3 moles of ferric ions.
So number of moles of ferric ions in 0.00042 moles of ferric nitrate is :
Volume of nitric acid = 13.00 mL
Total volume by adding all three volumes of solutions = V
V = 5.00 mL + 2.00 mL + 13.00 mL = 20.00 mL = 0.020 L
The analytical concentrations of thiocyanate ions:
The analytical concentrations of ferric ions: