Hydrochloric acid solution reacts with zinc according to the following equation:
2H3O + Zn -> Zn^2+ + H2 +2H2O
100ml of hydrochloric acid solution Ca=0.5mol/l must be prepared from C=5mol/l hydrochloric solution.
1) Specify the glassware needed for this preparation .
At time t=0 a volume Va=40ml of hydrochloric acid solution of concentration Ca=0.5mol/l is poured into a flask containing a mass 1g of powedered zinc . We admit that the volume of the mixture remains constant .
2) Explain the advantage of the use of powdered zinc instead of a zinc strip in this study.
If you want to dilute the solution from 5 M to 0.5 M, you must dilute by a factor of 10. You want 100 so take 10 mL and dilute to 100. For this you will need a 10 mL pipet and a 100 mL volumetric flask.
2. Powdered Zn has MUCH MORE surface area so the reaction is faster (MUCH FASTER).
1) To prepare 100ml of a hydrochloric acid solution with a concentration of Ca=0.5mol/l, the following glassware is typically needed:
- A 100ml volumetric flask: This flask is used to measure and store the final solution volume accurately. It has a narrow neck with a marking at the 100ml level.
- A pipette or a graduated cylinder: This glassware is used to measure and transfer the required volume of the concentrated hydrochloric acid solution (C=5mol/l) into the volumetric flask. The choice between a pipette or a graduated cylinder depends on the desired accuracy and precision.
- A balance: This equipment is used to accurately measure 1g of powdered zinc. The balance should have a precision of at least 0.01g.
- A spatula or scoopula: This is used to transfer the powdered zinc to the flask.
Make sure to clean and dry all glassware before use to avoid any contamination.
2) The advantage of using powdered zinc instead of a zinc strip in this study is that the reaction rate will be faster and more efficient. This is due to the increased surface area of the powdered zinc compared to a zinc strip.
When zinc is in the form of a strip, only the surface area that is exposed to the acid solution can react. However, when zinc is in a powdered form, the particles have a much larger total surface area. This increased surface area allows for more zinc particles to come into contact with the hydrochloric acid solution, resulting in a higher number of effective collisions between the reactants.
The increased number of effective collisions leads to a faster reaction rate, allowing for faster production of the desired products (Zn^2+, H2, and H2O). Therefore, in this study, the use of powdered zinc will result in a more rapid and efficient reaction compared to using a zinc strip.