0001 M HCl is the same as saying that 1 *10-4 moles of H+ ions have been added to solution. The -log[. 0001] =4, so the pH of the solution =4.
The pipette that accurately measures 0.8mL of fluid is P1000 micropipette.
It is given that:-
The volume of fluid = 0.8mL
We know that,
1 mL = 1000 microliter.
Hence,
0.8 mL = 0.8*1000 microliter = 800 microliter
We know that, a P1000 micropipette's volume ranges between 200 microliter to 1000 micro liter.
As,
200 < 800 < 100
Hence, P1000 micropipette is the right instrument.
The accuracy of this pipette decreases as volume decreases. Since the value 800 is near the maximum volume 1000 of the pipette, the accuracy of the pipette will be within a few percentages of the actual value.
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The flashlight's beam will all be refracted towards a central axis. But, this is still dependent on the type of lens that is used for the said activity. The speed of light will vary depending whether the lens is a concave or a convex lens. The exit point of the light will always head towards the central axis.
