I- Motlow State Co Saved work Complete the following statements using the pH sca

Question

I- Motlow State Co Saved work Complete the following statements using the pH scale provided when necessary equal OH stomach acid one thousand acidic one hundred 30 14 ten The pH scale ranges from to and is used to indicate the of a solution. ssomach acld 1 lemon juice 2 Coca-Cola, beer, vinegar 3 A solution with a(n) pH has a(n) number of H' and OH ions black coffee 5 uine 6 In both directions on the scale, between the whole number value, there is a difference of concentration of hydrogen ions and hydroxide ions. A pH of s s 100 times more acidic than a pH of 7 times the pure water, tears 7 neutral pheL Sea water, which has a pH of has a higher of than urine, which has a ph baking soda, stomach antacics of ammonia 11 bicarbonate of soda 12 There is ammonia as there is in seawater. times as much OH in household sodium thydroxide (NaC 14 Reset

Explanation / Answer

1. THe pH scale ranges from 0 to 14 and is used to indicate the alkanity of the solution. (Explanation: the range of the pH can Ben easily understood from the given figure and pH can be used to indicate the acidity and alkanity Of the solution, so as per the option it’s alkanity)

2. A solution with a neutral pH has an equal no. of H+ and OH- ions. (Explanation: pH = -log(H+), therefore when it is neutral ie. 7 [H+]=[OH-] given in the figure.

3. Ten. (Explanation: pH = -log10(H+), consider the example pH =7 => [H+] = 10-7 and pH=6 => [H+] = 10-6 , thus it can be inferred that variations of 10 times in concentration caused a whole no. difference in pH.

4. Seawater, which has a pH of 8 , has a higher concentration of OH ions than urine which has a pH of 6 (Explanation: as the OH ions increases pH increases. See figure)

5. One thousand. (Explanation: as explained earlier each whole number variation causes 10 times the difference in concentration since the  pH = -log(H+), pH of seawater=8= -log(10-8) and pH of household ammonia=11= -log(10-11). Therefore the difference is 1000 times.)

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