What mass of a 20% phosphoric acid solution is required to interact with a solution containing

What mass of a 20% phosphoric acid solution is required to interact with a solution containing 72 g of sodium hydroxide?

H3PO4 + 3NaOH = Na3PO4 + 3H2O.
1) According to the periodic table, we calculate the molar mass of sodium hydroxide: 23 + 16 + 1 = 40.
2) Find the amount of sodium hydroxide substance. To do this, divide the mass of the hydroxide by the molar mass: 72/40 = 1.8 mol.
3) According to the reaction equation, there is one mole of phosphoric acid for three moles of sodium hydroxide. This means that the amount of phosphoric acid substance is: 1.8 * 3 = 5.4 mol.
4) Molar mass of phosphoric acid: 3 + 31 + 64 = 98.
5) Mass of phosphoric acid: 98 * 5.4 = 529g.
6) Find the mass of the solution. To do this, we multiply the mass of phosphoric acid by one hundred percent and divide by the mass fraction of the substance: 529 * 100/20 = 2645g – the answer.




One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.

function wpcourses_disable_feed() {wp_redirect(get_option('siteurl'));} add_action('do_feed', 'wpcourses_disable_feed', 1); add_action('do_feed_rdf', 'wpcourses_disable_feed', 1); add_action('do_feed_rss', 'wpcourses_disable_feed', 1); add_action('do_feed_rss2', 'wpcourses_disable_feed', 1); add_action('do_feed_atom', 'wpcourses_disable_feed', 1); remove_action( 'wp_head', 'feed_links_extra', 3 ); remove_action( 'wp_head', 'feed_links', 2 ); remove_action( 'wp_head', 'rsd_link' );