Why the microscope is made an inclination joint?

inclination joint This is the joint between the pillar and the arm of the microscope. It is used to tilt the body tube and stage. It is usually best to keep the stage horizontal.

Explanation:

25 mL,50 mL, 20 mL

Explanation:

Molarity = numbers of mole / volume in liters

Glucose

stock solutions concentration = 1M

concentration needed = 0.05 M

volume of the preparation = 500ml = 500 / 1000 = 0.5l

number of moles of glucose in the solution = Molarity × molar mass = 0.05 × 0.5 L = 0.025 moles

volume of  the stock needed = number of moles / molarity of the stock solution = 0.025 moles / 1 M = 0.025L = 25 mL

Asparagine

Molarity of the stock solution = 100mM = 0.1 M

Molarity needed = 10mM = 0.01 M

volume of the prepared solution = 0.5 L

number of moles in the prepared solution = 0.01 M × 0.5 L = 0.005 moles

volume of the stock solution needed = number of moles of the prepared solution / Molarity of the stock = 0.005 / 0.1 = 0.05L = 50 mL

NaH₂PO₄

Molarity of the stock solution = 50 mM = 0.05 M

Molarity of the needed = 2 mM = 0.002 M

Volume of the prepared solution = 0.5 L

number of moles in the prepared solution = 0.002 M × 0.5 L = 0.002 × 0.5 L = 0.001 moles

volume of the stock needed = 0.001 moles / 0.05 M = 0.02 L = 20 mL