The question says: Find the gram equivalent masses for each of the following acids and bases.
a. H3PO4
b.Mg(OH)3
c.HF
How do I do this?
Thank You!!!
2007-05-30 07:25:25 · 6 answers · asked by ♥chloe♥ 2 in Science & Mathematics ➔ Chemistry
The gram-equivalent mass (weight) of each substance is the gram-molecular weight of each divided by the number of H+'s or OH-'s it has to react.
a. H3PO4 = 98/3 = 32.7
b. Mg(OH)2 = 58/2 = 29
c. HF = 20/1 = 20
2007-05-30 07:36:46 · answer #1 · answered by steve_geo1 7 · 0⤊ 0⤋
The gram equivalent mass of an acid is the molar mass divided by the number of H+.
The gram equivalent mass of a base is the molar mass divided by the number of OH-
a. H3PO4 has 3 H : gram equivalent mass = molar mass/3 =
= 97.97 / 3 = 32.6
b: Mg(OH)2 has 2 OH : gram equivalent mass = molar mass/ 2 = 58.3 / 2 = 29.15
c HF has 1 H . gram eqiuvalent mass = molar mass / 1 = 20/1 = 20
2007-05-30 07:33:29 · answer #2 · answered by Non più attiva su answers 7 · 0⤊ 0⤋
look on your periodic table and the number on the bottom of each element is like the mass number, so for Mg(OH)3, you'd add up 1 of the mass of magnesium, and 3 times the mass for oxygen and hydrogen (because its got that three there next to the bracket)
and like H3PO4 you would add up 3 times 1, cos 1 is the mass for hydrogen, and how much 1 mole of P is and how much 4 moles of oxygen is.
i think this is right :\ from my gcse chemistry knowledge.
2007-05-30 07:30:47 · answer #3 · answered by ULTRAviolet 2 · 0⤊ 0⤋
G'day,
put each item into the same sized container and weigh them.
or look up their weight in a chemistry book.
but that's cheating?
2007-05-30 07:31:09 · answer #4 · answered by Anonymous · 0⤊ 0⤋
check the per. table of ellements and see what one unit of the ellement is in grams then multiply that by the number of the ellement
2007-05-30 07:29:16 · answer #5 · answered by Anonymous · 0⤊ 0⤋
are you sure thats all there is to this exercise?? no further details?
2007-05-30 07:30:24 · answer #6 · answered by Q 2 · 0⤊ 0⤋