Answer:
Here's what I get
Explanation:
(a) Mass % of each ion
[tex]\text{Mass \%} = \dfrac{\text{mass}}{\text{total mass}} \times 100 \, \%\\\\= \dfrac{\text{mass}}{34 380} \times 100 \, \%\\= 2.903 \times 10^{-3} \times\text{"mass"} \, \%[/tex]
I used this template to calculate the percentages in the table below.
Ion Abundance Mass %
Na⁺ 10 560 30.72
K⁺ 380 1.11
Alkali metals 10 940 31.82
Mg²⁺ 1 270 3.69
Ca²⁺ 400 1.16
Alkaline earth metals 1 670 4.86
Total metal ions 12 610 36.68
Cl⁻ 18 980 55.20
SO₄²⁻ 2 650 7.71
HCO₃⁻ 140 0.41
Anions 21 770 63.32
TOTAL 34 380 100.00
(b) 30.72 % of the total mass is sodium ion.
(c) Alkaline earth metals vs alkali metals
[tex]\dfrac{\text{alkaline earth}}{\text{alkali}} = \dfrac{4.86}{31.82} = \dfrac{1 }{6.55}[/tex]
The mass percent of alkali metal ions is 6.55 times that of alkaline earth metal ions.
(d) The mass of anions is greater than that of cations.
