Experiment 5 Prelab Assignment CHEM 1090-General Chemistry I Name Section 1. Lit

Question

Experiment 5 Prelab Assignment CHEM 1090-General Chemistry I Name Section 1. Litmus turns what color in the presence of: a. an acid b. a base c. a neutral salt 2 turns what color in the presence of: a. an acid_ b. a base c. a neutral salt 3. Write the chemical formula formed from each set of ions K' and Crk Ca2 and Cr Li and So Na and NO Mg2 and NO, NH4 and NO ???, and so, > NH,' and so (. IH,' and cr Use the solubility rules for ionic compounds and determine whether each of the following is soluble r insoluble. Write the appropriate state label for each using an "aq for soluble and an "s" for insolu Li2SO4 NaOH NaNO3 a Mg(OH2 Mgso, Qu aCl2 Ca(NO3)2? AI(NO3)3

Explanation / Answer

1.Litmus turns what color in the presence of :

a. an acid --red b. a base--blue c. a neutral salt--purple

Litmus indicator solution turns red in acidic solutions and blue in alkaline solutions - and it turns purple in neutral solutions.

2.Phenolphthalein turns what color n the presence of:

a. acid-- colorless b. base--pink c.neutral--colorless

Phenolphthalein changes its color sharply at about pH 8.

It is pink in alkaline solutions and colourless in acidic solutions.

Red Litmus Blue Litmus Acidic solution Stays red Turns red Neutral solution Stays red Stays blue Alkaline solution Turns blue Stays blue

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