Calculate the grams of copper sulphate `(CuSO_(4))` needed to prepare `250.0 mL` of `1.00M CuSO_(4)` ?.

The valency of copper in CuSO_(4)*5H_(2)O is

Which of the following is the colour of copper sulphate (CuSO_4) ?

2.5 g sample of copper is dissolved in excess of H_(2)SO_(4) to prepare 100 mL of 0.02 M CuSO_(4) (aq) . 10 mL of 0.02 M solution of CuSO_(4) (aq) is mixed with excess of Kl to show the following changes CuSO_(4) + 2Kl to K_(2)SO_(4) + Cu l_(2) 2Cu l_(2) to Cu_(2)l_(2) + l_(2) The liberated iodine is titrated with hypo (na_(2)S_(2)O_(3)) and requires V mL of 0.1 M hypo solution for its complete reduction . The volume (V) of hypo required is :

2.5 g sample of copper is dissolved in excess of H_(2)SO_(4) to prepare 100 mL of 0.02 M CuSO_(4) (aq) . 10 mL of 0.02 M solution of CuSO_(4) (aq) is mixed with excess of Kl to show the following changes CuSO_(4) + 2Kl to K_(2)SO_(4) + Cu l_(2) 2Cu l_(2) to Cu_(2)l_(2) + l_(2) The liberated iodine is titrated with hypo (na_(2)S_(2)O_(3)) and requires V mL of 0.1 M hypo solution for its complete reduction . Percentage purity of sample is :

How many grams of NaOH will be needed to prepare 250 mL of 0.1 M solution-