As part of Lab 4 you will make and standardize a solution of NaOH(aq). Suppose in the lab you measure the solid NaOH and dissolve it into 100.0 mL of water. You then measure 0.2000 g of KHP (204.22 g/mol) and place it in a clean, dry 100-mL beaker, and then dissolve the KHP in about 25 mL of water and add a couple of drops of phenolphthalein indicator. You titrate this with your NaOH(aq) solution and find that the titration requires 9.78 mL of NaOH(aq). Part 1: How many moles of KHP are in your sample

The moles of KHP in the sample is

Explanation:

To calculate the number of moles, we use the equation:

Given mass of KHP = 0.2000 g

Molar mass of KHP = 204.22 g/mol

Putting values in above equation, we get:

Hence, the moles of KHP in the sample is

Adjusting the Flame. Use the needle valve to control the flame's size. The needle valve on the bottom of the Bunsen burner adjusts the gas flow rate, which determines the height of the flame. More gas will create a larger flame, and less gas gives you a smaller flame.

Explanation:

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