Help me with 1-6 please I am struggling 125 ANALO 7: Using Volumetric Glassware

Question

Help me with 1-6 please I am struggling

125 ANALO 7: Using Volumetric Glassware to Measure. Daure. and Tierate an Acid Solation Choshne Guerra Pre-Laboratory Assignment 1. Read discussion of the use of a volumetric flask, a pipet, and a buret an authoritative source for a 2. Describe the hazards associated HCI and NaoH solutions will use in this experiment with the you 3. a) What acid-base indicator is used for this titration? (2) What color is this indicator in a HC1 solution? (3) What color should appear in the solution at the end point of this titration?

Explanation / Answer

Q2

hazards with HCl alone --> it has a pretty low pH, ie. it is very acidic. it is a caustic material, will react readily with bases, it is eye/skin and respiratory tract irritant. Should not be ingested! It may form heat solutions when mixed with water alone....

hazards with NaOH alone --> it has a pretty high pH, ie. it is very basic. it is a caustic material, will react readily with bases, it is eye/skin and respiratory tract irritant. Should not be ingested! It may form heat solutions when mixed with water alone....

NaOH + HCl mixed --> this is highly exothermic, so be aware of drastic change in solutions!!

Q3.

acid-base indicators used for HCl and NaOH is typically phenolphtalein

It changes in the ranges of pH = 8-9

note that this appears to be "high" and far awayf rom pH = 7, but note that a very small amount of NaOH will change the pH drastically from 7 to 9, literally a small droplet

Q3

b)

HCL solution is acidic, so phenolphtalein will be TRANSPARENT

c)

the endpoint is when the solution has reached the equivalence point, th epoint in which mol of acid = mol of base

so... this will have a pH = 7-9 approx, so expect a purple color for the solution

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