2.0g of a monobasic acid was made up to 250 cm³ with distilled water. 25.00 cm³ of this solution required 20.00cm³ of 0.1 M NaOH solution for complete neutralization. The molar mass of the acid is?

olyezema

4 years ago

C=n/V
n=0.1×20/1000
n=2×10-³moles
25cm³ ------------ 2×10-³
250cm³ ---------- 250×2×10-³/25
n=m/M
M=m/n
M=2/0.02 =100g

vickyf

9 years ago

yes... u no dat ca va/cb vb=na/nb ... as u can see d mole for d base is 1i.e nb =1......since d acid is monobasic ...d mole will also b 1..i.e na=1.....xo ca va=cb vb...ca=cb vb/va....ca=20×0.1/25=0.08dm³..........for d acid dat has 2g in 250cm³ will av 8g in 1dm³(1000cm³).....dat means mass conc. for d acid =8gdm–³.....remeba dat molar mass =mass conc/molar conc....molar mass=8/0.08=100g

josephdaniel

9 years ago

those somebody have any other xplanation?...cos i dnt realy undastand dis one.