5. What is the approximate hydrogen/hydronium ion concentration in a cup of tea? (1 point) a) What is the approximate hydroxide ion concentration in a cup of tea? (1 point)
b) Which is higher? (2 points)
(tea has a pH of 4-6)

6. What is the approximate hydrogen/hydronium ion concentration in bleach? (1 point)

a) What is the approximate hydroxide ion concentration in bleach? (1 point)

b) Which is higher? (2 points)

(bleach pH is >12)

hloride, what is the mass of calcium in

explanation:

"you start with 15.67 g mgco3-xh2o, when heated and all the water is removed, you are left with 7.58 g mgco3 only.

therefore, you had 15.67 - 7.58 = 8.09g h2o  

moles of each :

7.58g mgco3 = ? moles = 7.58g / 83.4g/mole = 0.09moles  

8 09g h2o = ? moles = 8.09g / 18g/mole = 0.44moles  

molar ratio between the two by dividing both numbers by the smallest number :

0.09 / 0.09 = 1  

0.44 / 0.09 = 4.8  

mgco3-5h2o"