I need to prepare some buffers, namely HCl and NaOH. I want to prepare them at concentrations higher than 0.1M. The NaOH i have is just in pellet form and does not have a concentration or anything. The HCl is in liquid form and is 0.1 M. My question is can i use this 0.1M HCl to make 0.3 M HCl ? i need about 1 litre. And also the NaOH, how much will i have to add to make 0.3 M solution (1 litre)?