Photo AI

A 100 cm³ sample of lake water contained 0.016 g of suspended solids - Leaving Cert Chemistry - Question 1 - 2017

Question 1

A 100 cm³ sample of lake water contained 0.016 g of suspended solids. Express this concentration in parts per million (p.p.m. or mg per litre).

Worked Solution & Example Answer:A 100 cm³ sample of lake water contained 0.016 g of suspended solids - Leaving Cert Chemistry - Question 1 - 2017

Step 1

96%

114 rated

Answer

To convert grams to milligrams, we multiply by 1000:

$0.016 ext{ g} imes 1000 = 16 ext{ mg}$

Thus, in 100 cm³ of lake water, the concentration of suspended solids is 16 mg.

Step 2

99%

104 rated

Answer

Since 1 litre is equivalent to 1000 cm³, we can express this concentration in mg per litre:

$16 ext{ mg} imes 10 = 160 ext{ mg per litre}$

Therefore, the concentration in parts per million is:

$160 ext{ ppm}$

97% of Students

Report Improved Results

98% of Students

Recommend to friends

100,000+

Students Supported

1 Million+

Questions answered

;