The party has used the strategy before when there was pressure on Gordon Brown in March to apologise for his economic record.
It bought the term "Gordon Brown" with a link which sent people to a website called .
According to a party spokeswoman, today's tactics will involve buying key phrases from Chancellor Darling's speech to the House of Commons, scheduled to begin at 12.30pm.
The Google ads will link users to the party website, .
The Tory's hijack plans follow the Daily Telegraph's efforts yesterday to aggregate Tweets on Twitter for today's Budget.
The paper set out to stream any Tweet that included #budget tag on to a section called "Budget 2009 Twitterfall" on its Budget page.
Its efforts were, however, thwarted as Twitter users began inappropriately tagging their tweets to sink the Telegraph's efforts.
These included posts such as "Even the Indie is better than this drivel #Budget" and "Is tempted to use #budget to goatse the Torygraph, but is at work".
The Telegraph has since withdrawn its Budget 2009 Twitterfall, but more examples of Twitter users'