How much sodium hydroxide is required to make 250 cm...
How much sodium hydroxide is required to make 250 cm3 of 0.1 molar solution? Na=23; 0=16; H=1]
10.0 g
4.0g
2.0 g
1.0g
0.1 g
Correct answer is D
no of moles of Na = molar concentration X volume
= 0.1 x \(\frac{250}{1000}\) = 0.025
no of moles = \(\frac{m}{M}\)
mass = no of mles x molar mass = 0.025 x 40 = 1.0g ( molar mass of NaOH = 40g/mol)
The oxide that remains unchanged when heated in hydrogen is? ...
Which metal bromide is widely used in photography? ...
Which of the following compounds has the highest ionic character? ...
When air is passed through potash and then pyrogallol, the components are noble gases ...
A gas that turns a filter paper previously soaked in lead ethanoate solution black is? ...