Chapter 7. Acids & Bases. About Acids…. Sour taste Neutralize base Dissolves active metal Litmus indicator = red Definitions Arrhenius: form H + in water Bronsted-Lowry: donates a proton. About Bases…. Bitter taste Neutralize acid Feels slippery or “soapy” Litmus indicator = blue
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Acids & Bases
HCl + NaOH H2O + NaCl
H+ Cl- Na+ OH-
pH = – log [H+]
[H+] = 10-pH
~ 2 liters of stomach acid per day!
Nitric acid (HNO3) reacts with magnesium hydroxide in an acid-base neutralization reaction.
Write the balanced equation.
Name both products in the reaction.
2HNO3 + Mg(OH)2 2H2O + Mg(NO3)2
Water and magnesium nitrate
What is the molarity?
50.0g of potassium bromate dissolved in enough water to make 1.5L of solution (2 decimal places)
How many grams to weigh out?
Make 1.8L of a 0.75M solution of calcium perchlorate (2 decimal places)
What is the percent concentration? (1 decimal place)
45mL of ethanol dissolved in 1L of water
85g of NaCl dissolved in 315g of water
How many times more acidic is lemon juice (pH 1.5) than blood (pH 7.5)?
Something that is 10,000 times more basic than tomatoes (pH 4.2) would have a pH of what?
1,000,000 or 106 times more acidic
pH of 8.2
What is the pH? (2 decimal places)
[H+] = 1.87 x 10-4 M
What is the hydrogen ion concentration?
pH = 11.45
3.55 x 10-12 M